diff --git a/process/data_structure/blanket_variables.py b/process/data_structure/blanket_variables.py
index 0eb0f89713..05d2b9c7cf 100644
--- a/process/data_structure/blanket_variables.py
+++ b/process/data_structure/blanket_variables.py
@@ -17,9 +17,10 @@
 """
 
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 
 
+@unique
 class BlktModelTypes(IntEnum):
     """Enum for blanket model types. `i_blanket_type`"""
 
diff --git a/process/data_structure/buildings_variables.py b/process/data_structure/buildings_variables.py
index f1e99bdbdd..d123d242f2 100644
--- a/process/data_structure/buildings_variables.py
+++ b/process/data_structure/buildings_variables.py
@@ -1,9 +1,10 @@
 """Module containing variables for the buildings models"""
 
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 
 
+@unique
 class BuildingsModel(IntEnum):
     """Enum for building size estimation models, controlled by
     `i_bldgs_size` in `BuildingsData`.
diff --git a/process/data_structure/cost_variables.py b/process/data_structure/cost_variables.py
index 8b140e5c0b..bc2ad7d233 100644
--- a/process/data_structure/cost_variables.py
+++ b/process/data_structure/cost_variables.py
@@ -1,9 +1,10 @@
 """Module containing variables for the costs models"""
 
 from dataclasses import dataclass, field
-from enum import IntEnum
+from enum import IntEnum, unique
 
 
+@unique
 class CostModels(IntEnum):
     """Enum for cost model selection"""
 
diff --git a/process/data_structure/divertor_variables.py b/process/data_structure/divertor_variables.py
index 29934185b4..443af4fb2e 100644
--- a/process/data_structure/divertor_variables.py
+++ b/process/data_structure/divertor_variables.py
@@ -1,9 +1,10 @@
 """Module containing variables for the divertor models"""
 
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 
 
+@unique
 class DivertorHeatLoadModel(IntEnum):
     """Divertor heat load model enumeration, controlled' by `i_div_heat_load`"""
 
diff --git a/process/data_structure/numerics.py b/process/data_structure/numerics.py
index c45415f95b..43b0b78314 100644
--- a/process/data_structure/numerics.py
+++ b/process/data_structure/numerics.py
@@ -1,7 +1,7 @@
 """Module containing variables for the numerics"""
 
 from dataclasses import dataclass, field
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -9,6 +9,7 @@
 from process.core.solver.iteration_variables import ITERATION_VARIABLES
 
 
+@unique
 class SolverOutputCondition(IntEnum):
     """Enum for the possible conditions that can be returned by the solvers.
     This is for the `ifail` condition.
@@ -40,6 +41,7 @@ class SolverOutputCondition(IntEnum):
     """No feasible solution or bad approximation of Hessian (in VMCON only)."""
 
 
+@unique
 class PROCESSRunMode(IntEnum):
     """Enumeration of the available PROCESS run modes, which determine the behaviour
     of the code in various places. This is controlled by the `i_process_run_mode` variable
@@ -85,6 +87,7 @@ def description(self):
         return self._description_
 
 
+@unique
 class FiguresOfMerit(IntEnum):
     """Enumeration of the available figures of merit (FoM) that can be used as
     objective functions for optimisation in PROCESS.
diff --git a/process/data_structure/pfcoil_variables.py b/process/data_structure/pfcoil_variables.py
index 2942b13c69..efad8f5193 100644
--- a/process/data_structure/pfcoil_variables.py
+++ b/process/data_structure/pfcoil_variables.py
@@ -1,11 +1,12 @@
 """Module containing variables for the PF coil models"""
 
 from dataclasses import dataclass, field
-from enum import IntEnum
+from enum import IntEnum, unique
 
 import numpy as np
 
 
+@unique
 class PFConductorModel(IntEnum):
     """Enumeration for PF conductor models.
     Controlled via `i_pf_conductor`
diff --git a/process/data_structure/physics_variables.py b/process/data_structure/physics_variables.py
index 561ebb502a..046015ac4a 100644
--- a/process/data_structure/physics_variables.py
+++ b/process/data_structure/physics_variables.py
@@ -6,6 +6,7 @@
 import numpy as np
 
 
+@unique
 class OutbordSOLPowerDecayLengthModel(IntEnum):
     """Enum for outboard scrape off layer power decay length models with descriptions."""
 
@@ -35,6 +36,7 @@ def __new__(cls, value: int, description: str):
         return obj
 
 
+@unique
 class CurrentProfileIndexModel(IntEnum):
     """Enum for current profile index models."""
 
@@ -42,6 +44,7 @@ class CurrentProfileIndexModel(IntEnum):
     WESSON = 1
 
 
+@unique
 class PlasmaIgnitionModel(IntEnum):
     """Enum for plasma ignition models."""
 
@@ -49,6 +52,7 @@ class PlasmaIgnitionModel(IntEnum):
     IGNITED = 1
 
 
+@unique
 class DivertorNumberModels(IntEnum):
     """Enum for divertor number models. `i_single_null` is the index for this enum."""
 
@@ -56,6 +60,7 @@ class DivertorNumberModels(IntEnum):
     SINGLE_NULL = 1
 
 
+@unique
 class ConfinementMode(IntEnum):
     """Enum for plasma confinement mode"""
 
@@ -377,6 +382,7 @@ def __new__(cls, value: int, full_name: str, mode: ConfinementMode = None):
         return obj
 
 
+@unique
 class ConfinementRadiationLossModel(IntEnum):
     """Confinement radiation loss model types"""
 
diff --git a/process/data_structure/superconducting_tf_coil_variables.py b/process/data_structure/superconducting_tf_coil_variables.py
index eb551e5425..34faf78cf8 100644
--- a/process/data_structure/superconducting_tf_coil_variables.py
+++ b/process/data_structure/superconducting_tf_coil_variables.py
@@ -1,9 +1,10 @@
 """Module containing variables for the superconducting TF coil models"""
 
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 
 
+@unique
 class TFWPIntegerTurnType(IntEnum):
     """TF winding pack integer turn type, controlled via the `i_tf_turns_integer`
     variable.
diff --git a/process/data_structure/vacuum_variables.py b/process/data_structure/vacuum_variables.py
index 5c5829b852..2d836987a0 100644
--- a/process/data_structure/vacuum_variables.py
+++ b/process/data_structure/vacuum_variables.py
@@ -1,9 +1,10 @@
 """Module containing variables for the vacuum vessel models"""
 
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 
 
+@unique
 class VacuumPumpType(IntEnum):
     """Enum for vacuum pump types. Controlled via `i_vacuum_pump_type` in `VacuumData`."""
 
diff --git a/process/models/availability.py b/process/models/availability.py
index a6f804476e..31ba5ec91b 100644
--- a/process/models/availability.py
+++ b/process/models/availability.py
@@ -2,7 +2,7 @@
 
 import logging
 import math
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 from scipy.special import comb as combinations
@@ -16,6 +16,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class AvailabilityModel(IntEnum):
     """Enum for availability models"""
 
diff --git a/process/models/blankets/blanket_library.py b/process/models/blankets/blanket_library.py
index b381985142..ec293bed12 100644
--- a/process/models/blankets/blanket_library.py
+++ b/process/models/blankets/blanket_library.py
@@ -1,7 +1,7 @@
 """Library containing routines that can be shared by the blanket modules."""
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 
 import numpy as np
 
@@ -44,6 +44,7 @@
 # FCI         Flow Channel Insert
 
 
+@unique
 class FWBlktCoolantLoopTypes(IntEnum):
     """Enumeration for first wall and blanket coolant loop types.
     `i_fw_blkt_shared_coolant`.
diff --git a/process/models/build.py b/process/models/build.py
index d0f86fa049..d929c04f11 100644
--- a/process/models/build.py
+++ b/process/models/build.py
@@ -1,7 +1,7 @@
 """Module containing routines for build calculations"""
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 
 import numpy as np
 
@@ -23,6 +23,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class FwBlktVVShape(IntEnum):
     """Enum for first wall, blanket, and vacuum vessel shape options."""
 
diff --git a/process/models/engineering/pumping.py b/process/models/engineering/pumping.py
index ae7f2f6131..7ee6e0e29f 100644
--- a/process/models/engineering/pumping.py
+++ b/process/models/engineering/pumping.py
@@ -1,12 +1,13 @@
 """Engineering models for pumping system analysis."""
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
 
 
+@unique
 class CoolantType(IntEnum):
     """Enum for coolant types."""
 
diff --git a/process/models/pfcoil.py b/process/models/pfcoil.py
index 2343d3fde3..af0441a29a 100644
--- a/process/models/pfcoil.py
+++ b/process/models/pfcoil.py
@@ -3,7 +3,7 @@
 import logging
 import math
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 
 import numba
 import numpy as np
@@ -42,6 +42,7 @@
 N_CS_STRESS_PROFILE_POINTS = 20
 
 
+@unique
 class PFLocationTypes(IntEnum):
     """Enum for PF coil location types."""
 
diff --git a/process/models/physics/bootstrap_current.py b/process/models/physics/bootstrap_current.py
index d77bcbedb0..03d1887a52 100644
--- a/process/models/physics/bootstrap_current.py
+++ b/process/models/physics/bootstrap_current.py
@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 from typing import TYPE_CHECKING
 
@@ -23,6 +23,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class BootstrapCurrentFractionModel(IntEnum):
     """Bootstrap plasma current fraction (f_BS) model types"""
 
diff --git a/process/models/physics/current_drive.py b/process/models/physics/current_drive.py
index ca9c086e67..61c1df7ff7 100644
--- a/process/models/physics/current_drive.py
+++ b/process/models/physics/current_drive.py
@@ -1,7 +1,7 @@
 """Module for current drive physics models and heating method types."""
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -18,6 +18,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class CurrentDriveMethodType(IntEnum):
     """Enum for heating and current drive method types"""
 
@@ -41,6 +42,7 @@ def abbreviation(self):
         return self._abbreviation_
 
 
+@unique
 class CurrentDriveModel(IntEnum):
     """Heating and current drive models for use in current drive calculations"""
 
diff --git a/process/models/physics/density_limit.py b/process/models/physics/density_limit.py
index 28b330534c..3ea8c31bc0 100644
--- a/process/models/physics/density_limit.py
+++ b/process/models/physics/density_limit.py
@@ -6,7 +6,7 @@
 """
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -19,6 +19,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class DensityLimitModel(IntEnum):
     """Electron density model types"""
 
diff --git a/process/models/physics/l_h_transition.py b/process/models/physics/l_h_transition.py
index 70c12584a8..dac95c23d3 100644
--- a/process/models/physics/l_h_transition.py
+++ b/process/models/physics/l_h_transition.py
@@ -1,7 +1,7 @@
 """Module for plasma L-H and L-I transition power threshold calculations."""
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 
 from process.core import constants
 from process.core import process_output as po
@@ -10,6 +10,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class PlasmaConfinementTransitionModel(IntEnum):
     """Enum for plasma L -> H and L -> I transition power threshold models."""
 
diff --git a/process/models/physics/physics.py b/process/models/physics/physics.py
index 95b6d126a8..926e0eee8f 100644
--- a/process/models/physics/physics.py
+++ b/process/models/physics/physics.py
@@ -4,7 +4,7 @@
 
 import logging
 import math
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 from typing import TYPE_CHECKING
 
@@ -3665,6 +3665,7 @@ def reinke_tsep(b_plasma_toroidal_on_axis, flh, qstar, rmajor, eps, fgw, kappa,
     )
 
 
+@unique
 class BetaNormMaxModel(IntEnum):
     """Beta norm max (β_N_max) model types"""
 
@@ -3688,6 +3689,7 @@ def full_name(self):
         return self._full_name_
 
 
+@unique
 class BetaComponentLimits(IntEnum):
     """Beta component to apply limit types"""
 
@@ -4679,6 +4681,7 @@ def output_beta_information(self):
         po.oblnkl(self.outfile)
 
 
+@unique
 class IndInternalNormModel(IntEnum):
     """Normalised internal inductance (lᵢ) model types"""
 
diff --git a/process/models/physics/plasma_current.py b/process/models/physics/plasma_current.py
index cc1c12da37..e7d3e5910f 100644
--- a/process/models/physics/plasma_current.py
+++ b/process/models/physics/plasma_current.py
@@ -6,7 +6,7 @@
 """
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numba as nb
@@ -21,6 +21,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class PlasmaCurrentModel(IntEnum):
     """Enumeration of plasma current scaling models available for calculations.
 
@@ -1016,6 +1017,7 @@ def calculate_current_coefficient_fiesta(
         return 0.538 * (1.0 + 2.440 * eps**2.736) * kappa**2.154 * triang**0.060
 
 
+@unique
 class PlasmaDiamagneticCurrentModel(IntEnum):
     """Enum for plasma diamagnetic current method types"""
 
diff --git a/process/models/physics/plasma_geometry.py b/process/models/physics/plasma_geometry.py
index e91029c4a4..99ba1bd7d8 100644
--- a/process/models/physics/plasma_geometry.py
+++ b/process/models/physics/plasma_geometry.py
@@ -1,7 +1,7 @@
 """Plasma geometry models and shape definitions for PROCESS."""
 
 import logging
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -14,6 +14,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class PlasmaShapeModelType(IntEnum):
     """Enum for plasma shape model types."""
 
@@ -33,6 +34,7 @@ def full_name(self):
         return self._full_name_
 
 
+@unique
 class PlasmaGeometryModels(IntEnum):
     """Enum for plasma geometry model types."""
 
@@ -60,6 +62,7 @@ def description(self):
         return self._description_
 
 
+@unique
 class PlasmaGeometryModelType(IntEnum):
     """Enum for i_plasma_geometry plasma geometry model types."""
 
diff --git a/process/models/physics/profiles.py b/process/models/physics/profiles.py
index 2a655789b2..53342d9abc 100644
--- a/process/models/physics/profiles.py
+++ b/process/models/physics/profiles.py
@@ -6,7 +6,7 @@
 
 import logging
 from abc import ABC, abstractmethod
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -19,6 +19,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class PlasmaProfileShapeType(IntEnum):
     """Enum for i_plasma_pedestal method types"""
 
@@ -112,6 +113,7 @@ def integrate_profile_y(self):
         )
 
 
+@unique
 class DensityProfilePedestalType(IntEnum):
     """Enum for i_nd_plasma_pedestal_separatrix types"""
 
diff --git a/process/models/power.py b/process/models/power.py
index 144b6961aa..99a3f4d296 100644
--- a/process/models/power.py
+++ b/process/models/power.py
@@ -2,7 +2,7 @@
 
 import logging
 import math
-from enum import IntEnum
+from enum import IntEnum, unique
 
 import numpy as np
 import scipy as sp
@@ -16,6 +16,7 @@
 from process.models.pulse import PulseTimings
 
 
+@unique
 class PumpingPowerModelTypes(IntEnum):
     """Pumping power model types for `i_p_coolant_pumping` in `fwbs_variables`"""
 
@@ -28,6 +29,7 @@ class PumpingPowerModelTypes(IntEnum):
 logger = logging.getLogger(__name__)
 
 
+@unique
 class ElectricConversionModelTypes(IntEnum):
     """Enum for thermal to electric power conversion model types."""
 
diff --git a/process/models/superconductors.py b/process/models/superconductors.py
index 2590fd9b4c..da470ed75a 100644
--- a/process/models/superconductors.py
+++ b/process/models/superconductors.py
@@ -2,7 +2,7 @@
 
 import logging
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -15,6 +15,7 @@
 N_CROCO_STRANDS_TURN = 6
 
 
+@unique
 class SuperconductorShape(IntEnum):
     """Enumeration of superconductor shapes."""
 
@@ -24,6 +25,7 @@ class SuperconductorShape(IntEnum):
     "The superconductor is in the form of a flat tape with a rectangular cross-section"
 
 
+@unique
 class SuperconductorType(IntEnum):
     """Enumeration of superconductor types."""
 
@@ -43,6 +45,7 @@ def abbreviation(self):
         return self._abbreviation_
 
 
+@unique
 class SuperconductorMaterial(IntEnum):
     """Enumeration of superconductor materials."""
 
@@ -70,6 +73,7 @@ def material_name(self):
         return self._material_name_
 
 
+@unique
 class SuperconductorModel(IntEnum):
     """Enumeration of superconductor models."""
 
diff --git a/process/models/tfcoil/base.py b/process/models/tfcoil/base.py
index c253aac5b4..ce106eee3b 100644
--- a/process/models/tfcoil/base.py
+++ b/process/models/tfcoil/base.py
@@ -6,7 +6,7 @@
 import json
 import logging
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numba
@@ -28,6 +28,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class TFCoilShapeModel(IntEnum):
     """Enumeration for TF coil shape models.
     0: Auto-select
@@ -41,6 +42,7 @@ class TFCoilShapeModel(IntEnum):
     PICTURE_FRAME = 2
 
 
+@unique
 class TFConductorModel(IntEnum):
     """Enumeration for TF conductor models.
 
@@ -55,6 +57,7 @@ class TFConductorModel(IntEnum):
     HELIUM_COOLED_ALUMINIUM = 2
 
 
+@unique
 class TFPlasmaCaseType(IntEnum):
     """Enumeration for TF plasma-facing case types (i_tf_case_geom).
 
diff --git a/process/models/tfcoil/superconducting.py b/process/models/tfcoil/superconducting.py
index 56162e2469..2e0a346a55 100644
--- a/process/models/tfcoil/superconducting.py
+++ b/process/models/tfcoil/superconducting.py
@@ -2,7 +2,7 @@
 
 import logging
 from dataclasses import dataclass
-from enum import IntEnum
+from enum import IntEnum, unique
 from types import DynamicClassAttribute
 
 import numpy as np
@@ -27,6 +27,7 @@
 logger = logging.getLogger(__name__)
 
 
+@unique
 class SuperconductingTFTurnType(IntEnum):
     """Enum for the type of TF coil turn, which determines the superconductor properties
     and stress calculations.
@@ -74,6 +75,7 @@ def _missing_(cls, value):
             ) from None
 
 
+@unique
 class SuperconductingTFWPShapeType(IntEnum):
     """Enum for the type of TF coil WP shape, which determines the geometry of the
     winding pack and ground insulation.