diff --git a/schemas/app.json b/schemas/app.json
index 51902063..e436a7ef 100644
--- a/schemas/app.json
+++ b/schemas/app.json
@@ -13,6 +13,19 @@
     }
   ],
   "definitions": {
+    "ApplicationDataBase": {
+      "additionalProperties": false,
+      "description": "Base type for ApplicationData. Contains all shared properties across all application types",
+      "properties": {
+        "somethingShared": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "somethingShared"
+      ],
+      "type": "object"
+    },
     "BaseWTT": {
       "additionalProperties": false,
       "properties": {
@@ -24,25 +37,7 @@
           "additionalProperties": false,
           "properties": {
             "application": {
-              "additionalProperties": false,
-              "properties": {
-                "applicationType": {
-                  "const": "wtt",
-                  "type": "string"
-                },
-                "somethingShared": {
-                  "type": "string"
-                },
-                "wttSpecificProperty": {
-                  "type": "number"
-                }
-              },
-              "required": [
-                "applicationType",
-                "somethingShared",
-                "wttSpecificProperty"
-              ],
-              "type": "object"
+              "$ref": "#/definitions/WTTApplicationData"
             },
             "user": {
               "$ref": "#/definitions/WTTUser"
@@ -72,25 +67,7 @@
           "additionalProperties": false,
           "properties": {
             "application": {
-              "additionalProperties": false,
-              "properties": {
-                "applicationType": {
-                  "const": "wtt.consent",
-                  "type": "string"
-                },
-                "somethingShared": {
-                  "type": "string"
-                },
-                "wttSpecificProperty": {
-                  "type": "number"
-                }
-              },
-              "required": [
-                "applicationType",
-                "somethingShared",
-                "wttSpecificProperty"
-              ],
-              "type": "object"
+              "$ref": "#/definitions/WTTApplicationData"
             },
             "user": {
               "$ref": "#/definitions/WTTUser"
@@ -120,25 +97,7 @@
           "additionalProperties": false,
           "properties": {
             "application": {
-              "additionalProperties": false,
-              "properties": {
-                "applicationType": {
-                  "const": "wtt.notice",
-                  "type": "string"
-                },
-                "somethingShared": {
-                  "type": "string"
-                },
-                "wttSpecificProperty": {
-                  "type": "number"
-                }
-              },
-              "required": [
-                "applicationType",
-                "somethingShared",
-                "wttSpecificProperty"
-              ],
-              "type": "object"
+              "$ref": "#/definitions/WTTApplicationData"
             },
             "user": {
               "$ref": "#/definitions/WTTUser"
@@ -157,6 +116,23 @@
       ],
       "type": "object"
     },
+    "PPApplicationData": {
+      "additionalProperties": false,
+      "description": "Specific ApplicationData required for \"Planning Permission\" applications",
+      "properties": {
+        "ppSpecificProperty": {
+          "type": "number"
+        },
+        "somethingShared": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "ppSpecificProperty",
+        "somethingShared"
+      ],
+      "type": "object"
+    },
     "PPUser": {
       "additionalProperties": false,
       "properties": {
@@ -189,25 +165,7 @@
           "additionalProperties": false,
           "properties": {
             "application": {
-              "additionalProperties": false,
-              "properties": {
-                "applicationType": {
-                  "const": "pp",
-                  "type": "string"
-                },
-                "ppSpecificProperty": {
-                  "type": "number"
-                },
-                "somethingShared": {
-                  "type": "string"
-                }
-              },
-              "required": [
-                "applicationType",
-                "ppSpecificProperty",
-                "somethingShared"
-              ],
-              "type": "object"
+              "$ref": "#/definitions/PPApplicationData"
             },
             "user": {
               "$ref": "#/definitions/PPUser"
@@ -237,21 +195,7 @@
           "additionalProperties": false,
           "properties": {
             "application": {
-              "additionalProperties": false,
-              "properties": {
-                "applicationType": {
-                  "const": "pa",
-                  "type": "string"
-                },
-                "somethingShared": {
-                  "type": "string"
-                }
-              },
-              "required": [
-                "applicationType",
-                "somethingShared"
-              ],
-              "type": "object"
+              "$ref": "#/definitions/ApplicationDataBase"
             },
             "user": {
               "$ref": "#/definitions/UserBase"
@@ -287,6 +231,23 @@
       ],
       "type": "object"
     },
+    "WTTApplicationData": {
+      "additionalProperties": false,
+      "description": "Specific ApplicationData required for \"Works to trees\" applications",
+      "properties": {
+        "somethingShared": {
+          "type": "string"
+        },
+        "wttSpecificProperty": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "somethingShared",
+        "wttSpecificProperty"
+      ],
+      "type": "object"
+    },
     "WTTUser": {
       "additionalProperties": false,
       "properties": {
diff --git a/types/schemas/app/ApplicationData.ts b/types/schemas/app/ApplicationData.ts
index 229a1a0a..fb95ca79 100644
--- a/types/schemas/app/ApplicationData.ts
+++ b/types/schemas/app/ApplicationData.ts
@@ -1,28 +1,23 @@
-import {
-  ApplicationTypeKeys,
-  PrimaryApplicationType,
-} from '../digitalPlanningApplication/enums/ApplicationTypes';
+import {PrimaryApplicationType} from '../digitalPlanningApplication/enums/ApplicationTypes';
 
 /**
- * @internal
  * Base type for ApplicationData. Contains all shared properties across all application types
  */
-export interface ApplicationDataBase<TGranular extends ApplicationTypeKeys> {
-  applicationType: TGranular;
+export interface ApplicationDataBase {
   somethingShared: string;
 }
 
 /**
  * @description Specific ApplicationData required for "Works to trees" applications
  */
-export interface WTTApplicationData {
+export interface WTTApplicationData extends ApplicationDataBase {
   wttSpecificProperty: number;
 }
 
 /**
  * @description Specific ApplicationData required for "Planning Permission" applications
  */
-export interface PPApplicationData {
+export interface PPApplicationData extends ApplicationDataBase {
   ppSpecificProperty: number;
 }
 
@@ -37,11 +32,8 @@ export interface ApplicationDataVariants {
 /**
  * @internal
  * Conditional type to return a specific or generic ApplicationData model, based on PrimaryApplicationType
- * TPrimary and TGranular are both required as the granular variable is exposed, and must match the value in the Application root
  */
-export type ApplicationData<
-  TPrimary extends PrimaryApplicationType,
-  TGranular extends ApplicationTypeKeys,
-> = TPrimary extends keyof ApplicationDataVariants
-  ? ApplicationDataVariants[TPrimary] & ApplicationDataBase<TGranular>
-  : ApplicationDataBase<TGranular>;
+export type ApplicationData<TPrimary extends PrimaryApplicationType> =
+  TPrimary extends keyof ApplicationDataVariants
+    ? ApplicationDataVariants[TPrimary]
+    : ApplicationDataBase;
diff --git a/types/schemas/app/index.ts b/types/schemas/app/index.ts
index ce35cfbb..8cd96be2 100644
--- a/types/schemas/app/index.ts
+++ b/types/schemas/app/index.ts
@@ -18,7 +18,7 @@ interface ApplicationSpecification<
   applicationType: TGranular;
   data: {
     user: User<TPrimary>;
-    application: ApplicationData<TPrimary, TGranular>;
+    application: ApplicationData<TPrimary>;
   };
 }
 
@@ -56,7 +56,6 @@ export type App =
 //       wttSpecificProperty: true,
 //     },
 //     application: {
-//       applicationType: 'wtt.consent',
 //       wttSpecificProperty: 123,
 //       somethingShared: 'abc',
 //     },