diff --git a/hdr_schemata/definitions/HDRUK/AccessService.py b/hdr_schemata/definitions/HDRUK/AccessService.py
new file mode 100644
index 0000000..8807888
--- /dev/null
+++ b/hdr_schemata/definitions/HDRUK/AccessService.py
@@ -0,0 +1,8 @@
+from enum import Enum
+
+
+class AccessService(Enum):
+    TRE_SDE = "TRE/SDE"
+    DIRECT_ACCESS = "Direct access"
+    OPEN_ACCESS = "Open access"
+    VARIED = "Varies based on project"
diff --git a/hdr_schemata/definitions/HDRUK/__init__.py b/hdr_schemata/definitions/HDRUK/__init__.py
index 34fed8d..3ffec8f 100644
--- a/hdr_schemata/definitions/HDRUK/__init__.py
+++ b/hdr_schemata/definitions/HDRUK/__init__.py
@@ -1,4 +1,5 @@
 from .AbstractText import AbstractText
+from .AccessService import AccessService
 from .AgeRange import AgeRange
 from .CommaSeparatedIntegers import CommaSeparatedIntegers
 from .CommaSeparatedValues import CommaSeparatedValues
diff --git a/hdr_schemata/models/GWDM/v1_0/__init__.py b/hdr_schemata/models/GWDM/v1_0/__init__.py
index 26758fc..946a55d 100644
--- a/hdr_schemata/models/GWDM/v1_0/__init__.py
+++ b/hdr_schemata/models/GWDM/v1_0/__init__.py
@@ -15,62 +15,61 @@
 from .Linkage import Linkage
 from .Observations import Observation
 from .DataTable import DataTable
+
 from .Usage import Usage
+from .Access import Access
+
 
 class Gwdm10(BaseModel):
     class Config:
-        extra = 'forbid'
+        extra = "forbid"
 
     required: Required = Field(
-        ...,
-        description='required metadata needed for the GWDM',
-        title='Required'
+        ..., description="required metadata needed for the GWDM", title="Required"
     )
 
     summary: Summary = Field(
         ...,
-        description='Summary of metadata describing key pieces of information.',
-        title='Summary',
+        description="Summary of metadata describing key pieces of information.",
+        title="Summary",
     )
-    
+
     coverage: Optional[Coverage] = Field(
         None,
-        description='Spatial and Temporal coverage',
-        title='Coverage',
+        description="Spatial and Temporal coverage",
+        title="Coverage",
     )
 
     provenance: Optional[Provenance] = Field(
         None,
-        description='Provenance information',
-        title='Provenance',
+        description="Provenance information",
+        title="Provenance",
     )
-    
+
     accessibility: Accessibility = Field(
         None,
-        description='Accessibility information.',
-        title='Accessibility',
+        description="Accessibility information.",
+        title="Accessibility",
     )
-    
+
     linkage: Optional[Linkage] = Field(
         None,
-        description='Linkage and enrichment.',
-        title='Linkage',
+        description="Linkage and enrichment.",
+        title="Linkage",
     )
-    
+
     observations: Optional[List[Observation]] = Field(
         None,
-        description='Obsservations',
-        title='Observations',
+        description="Obsservations",
+        title="Observations",
     )
     structuralMetadata: Optional[List[DataTable]] = Field(
         None,
-        description='Descriptions of all tables and data elements that can be included in the dataset',
-        title='Structural Metadata',
+        description="Descriptions of all tables and data elements that can be included in the dataset",
+        title="Structural Metadata",
     )
 
-
     @classmethod
-    def save_schema(cls,location='./1.0/schema.json'):
-        with open(location,'w') as f:
-            json.dump(cls.model_json_schema(),f,indent=6)
- 
+    def save_schema(cls, location="./1.0/schema.json"):
+        with open(location, "w") as f:
+            json.dump(cls.model_json_schema(), f, indent=6)
diff --git a/hdr_schemata/models/GWDM/v1_2/Access.py b/hdr_schemata/models/GWDM/v1_2/Access.py
new file mode 100644
index 0000000..caf895f
--- /dev/null
+++ b/hdr_schemata/models/GWDM/v1_2/Access.py
@@ -0,0 +1,15 @@
+from typing import Optional
+from pydantic import Field
+from hdr_schemata.definitions.HDRUK import CommaSeparatedValues
+
+
+from hdr_schemata.models.GWDM.v1_1 import Access as BaseAccess
+
+
+class Access(BaseAccess):
+    accessServiceCategory = Optional[CommaSeparatedValues] = Field(
+        None,
+        description="Where access to data come from: TRE/SED, direct access, open acccess, varies based on project.",
+        example="",
+        title="Access/governance requirementss",
+    )
diff --git a/hdr_schemata/models/GWDM/v1_2/Accessibility.py b/hdr_schemata/models/GWDM/v1_2/Accessibility.py
new file mode 100644
index 0000000..5f1cdab
--- /dev/null
+++ b/hdr_schemata/models/GWDM/v1_2/Accessibility.py
@@ -0,0 +1,13 @@
+from pydantic import Field
+from hdr_schemata.definitions.HDRUK import *
+
+from hdr_schemata.models.GWDM.v1_1 import Accessibility as BaseAccessibility
+from .Access import Access
+
+
+class Accessibility(BaseAccessibility):
+    access: Access = Field(
+        ...,
+        description="This section includes information about data access",
+        title="Access",
+    )
diff --git a/hdr_schemata/models/GWDM/v1_2/__init__.py b/hdr_schemata/models/GWDM/v1_2/__init__.py
index ac1113e..5165ce7 100644
--- a/hdr_schemata/models/GWDM/v1_2/__init__.py
+++ b/hdr_schemata/models/GWDM/v1_2/__init__.py
@@ -1,7 +1,9 @@
 from hdr_schemata.models.GWDM import Gwdm11
-
 from hdr_schemata.models.GWDM.v1_1 import *
+
+from .Accessibility import Accessibility
 from .Linkage import Linkage
+
 from typing import Optional, List
 from pydantic import Field
 
@@ -12,3 +14,9 @@ class Gwdm12(Gwdm11):
         description="Linkage and enrichment.",
         title="Linkage",
     )
+
+    accessibility: Accessibility = Field(
+        None,
+        description="Accessibility information.",
+        title="Accessibility",
+    )
diff --git a/hdr_schemata/models/HDRUK/v2_2_1/Access.py b/hdr_schemata/models/HDRUK/v2_2_1/Access.py
new file mode 100644
index 0000000..cc24212
--- /dev/null
+++ b/hdr_schemata/models/HDRUK/v2_2_1/Access.py
@@ -0,0 +1,14 @@
+from typing import Optional, List
+from pydantic import Field
+from hdr_schemata.definitions.HDRUK import AccessService
+
+from hdr_schemata.models.GWDM.v1_1 import Access as BaseAccess
+
+
+class Access(BaseAccess):
+    accessServiceCategory = Optional[List[AccessService]] = Field(
+        None,
+        description="Where access to data come from: TRE/SED, direct access, open acccess, varies based on project.",
+        example="",
+        title="Access/governance requirementss",
+    )
diff --git a/hdr_schemata/models/HDRUK/v2_2_1/Accessibility.py b/hdr_schemata/models/HDRUK/v2_2_1/Accessibility.py
new file mode 100644
index 0000000..0aa9497
--- /dev/null
+++ b/hdr_schemata/models/HDRUK/v2_2_1/Accessibility.py
@@ -0,0 +1,27 @@
+from typing import Optional
+from pydantic import BaseModel, Field
+from hdr_schemata.definitions.HDRUK import *
+
+from .Usage import Usage
+from .Access import Access
+from .FormatAndStandards import FormatAndStandards
+
+class Accessibility(BaseModel):
+    class Config:
+        extra = 'forbid'
+
+    usage: Optional[Usage] = Field(
+        None,
+        description='This section includes information about how the data can be used and how it is currently being used',
+        title='Usage',
+    )
+    access: Access = Field(
+        ...,
+        description='This section includes information about data access',
+        title='Access',
+    )
+    formatAndStandards: Optional[FormatAndStandards] = Field(
+        None,
+        description='Section includes technical attributes for language vocabularies, sizes etc. and gives researchers facts about and processing the underlying data in the dataset.',
+        title='Format and Standards',
+    )
diff --git a/hdr_schemata/models/HDRUK/v2_2_1/__init__.py b/hdr_schemata/models/HDRUK/v2_2_1/__init__.py
index aa05f30..0fa2541 100644
--- a/hdr_schemata/models/HDRUK/v2_2_1/__init__.py
+++ b/hdr_schemata/models/HDRUK/v2_2_1/__init__.py
@@ -4,6 +4,7 @@
 from pydantic import Field
 
 from .EnrichmentAndLinkage import EnrichmentAndLinkage
+from .Accessibility import Accessibility
 
 
 class Hdruk221(Hdruk220):
@@ -14,6 +15,12 @@ class Hdruk221(Hdruk220):
         title="Enrichment and Linkage",
     )
 
+    accessibility: Accessibility = Field(
+        ...,
+        description="Accessibility information allows researchers to understand access, usage, limitations, formats, standards and linkage or interoperability with toolsets.",
+        title="Accessibility",
+    )
+
     @classmethod
     def save_schema(cls, location="./2.2.1/schema.json"):
         with open(location, "w") as f: