diff --git a/server/@types/ActivityLog.type.ts b/server/@types/ActivityLog.type.ts
index a2e343b0..f91967d4 100644
--- a/server/@types/ActivityLog.type.ts
+++ b/server/@types/ActivityLog.type.ts
@@ -30,10 +30,16 @@ export interface ActivityLogFiltersResponse extends ActivityLogFilters {
   queryStrPrefix: string
   queryStrSuffix: string
   maxDate: string
+  query?: ActivityLogFilters
 }
 
-export interface ActivityLogCache extends ActivityLogFilters {
+export interface ActivityLogCacheItem extends ActivityLogFilters {
   crn: string
   personActivity: PersonActivity
   tierCalculation: TierCalculation
 }
+
+export interface ActivityLogCache {
+  results: ActivityLogCacheItem[]
+  filters?: ActivityLogFilters
+}
diff --git a/server/@types/express/index.d.ts b/server/@types/express/index.d.ts
index 3e0d8df7..2c5177ad 100644
--- a/server/@types/express/index.d.ts
+++ b/server/@types/express/index.d.ts
@@ -18,7 +18,7 @@ declare module 'express-session' {
     data?: Data
     errors?: Errors
     cache?: {
-      activityLog: ActivityLogCache[]
+      activityLog: ActivityLogCache
     }
   }
 
diff --git a/server/middleware/getPersonActivity.test.ts b/server/middleware/getPersonActivity.test.ts
new file mode 100644
index 00000000..62346eb8
--- /dev/null
+++ b/server/middleware/getPersonActivity.test.ts
@@ -0,0 +1,174 @@
+import { Request } from 'express'
+import { getPersonActivity } from './getPersonActivity'
+import { AppResponse } from '../@types'
+import HmppsAuthClient from '../data/hmppsAuthClient'
+
+const crn = 'X756510'
+const mockPersonActivityResponse = {
+  size: 10,
+  page: 1,
+  totalResults: 20,
+  totalPages: 2,
+  personSummary: {
+    crn,
+    name: {
+      forename: 'Eula',
+      surname: 'Schmeler',
+    },
+    dateOfBirth: '',
+  },
+  activities: [
+    {
+      id: '11',
+      type: 'Phone call',
+      startDateTime: '2044-12-22T09:15:00.382936Z[Europe/London]',
+      endDateTime: '2044-12-22T09:30:00.382936Z[Europe/London]',
+      rarToolKit: 'Choices and Changes',
+      rarCategory: 'Stepping Stones',
+      isSensitive: false,
+      hasOutcome: false,
+      wasAbsent: true,
+      notes: '',
+
+      isCommunication: true,
+      isPhoneCallFromPop: true,
+      officerName: {
+        forename: 'Terry',
+        surname: 'Jones',
+      },
+      lastUpdated: '2023-03-20',
+      lastUpdatedBy: {
+        forename: 'Paul',
+        surname: 'Smith',
+      },
+    },
+  ],
+}
+const mockTierCalculationResponse = {
+  tierScore: '1',
+  calculationId: '1',
+  calculationDate: '',
+  data: {
+    protect: {
+      tier: '',
+      points: 1,
+      pointsBreakdown: {
+        NEEDS: 1,
+        NO_MANDATE_FOR_CHANGE: 1,
+        NO_VALID_ASSESSMENT: 1,
+        OGRS: 1,
+        IOM: 1,
+        RSR: 1,
+        ROSH: 1,
+        MAPPA: 1,
+        COMPLEXITY: 1,
+        ADDITIONAL_FACTORS_FOR_WOMEN: 1,
+      },
+    },
+    change: {
+      tier: '',
+      points: 1,
+      pointsBreakdown: {
+        NEEDS: 1,
+        NO_MANDATE_FOR_CHANGE: 1,
+        NO_VALID_ASSESSMENT: 1,
+        OGRS: 1,
+        IOM: 1,
+        RSR: 1,
+        ROSH: 1,
+        MAPPA: 1,
+        COMPLEXITY: 1,
+        ADDITIONAL_FACTORS_FOR_WOMEN: 1,
+      },
+    },
+    calculationVersion: '',
+  },
+}
+
+jest.mock('../data/hmppsAuthClient', () => {
+  return jest.fn().mockImplementation(() => {
+    return {
+      getSystemClientToken: jest.fn().mockImplementation(() => Promise.resolve('token-1')),
+    }
+  })
+})
+jest.mock('../data/masApiClient', () => {
+  return jest.fn().mockImplementation(() => {
+    return {
+      postPersonActivityLog: jest.fn().mockImplementation(() => Promise.resolve(mockPersonActivityResponse)),
+    }
+  })
+})
+
+jest.mock('../data/tierApiClient', () => {
+  return jest.fn().mockImplementation(() => {
+    return {
+      getCalculationDetails: jest.fn().mockImplementation(() => Promise.resolve(mockTierCalculationResponse)),
+    }
+  })
+})
+
+const hmppsAuthClient = new HmppsAuthClient(null) as jest.Mocked<HmppsAuthClient>
+
+describe('/middleware/getPersonActivity', () => {
+  const req = {
+    body: {},
+    params: {},
+    query: {},
+    session: {},
+    method: 'GET',
+  } as Request
+
+  const res = {
+    locals: {
+      filters: {},
+      user: {
+        username: 'user-1',
+      },
+    },
+    redirect: jest.fn().mockReturnThis(),
+  } as unknown as AppResponse
+
+  const filterVals = {
+    keywords: 'Some keywords',
+    dateFrom: '14/1/2025',
+    dateTo: '21/1/2025',
+    compliance: ['complied', 'not complied'],
+  }
+
+  it('should request the filtered results from the api, if matching cache does not exist', async () => {
+    req.query = { page: '0' }
+    res.locals.filters = {
+      ...filterVals,
+      complianceOptions: [],
+      errors: null,
+      selectedFilterItems: [],
+      baseUrl: '',
+      query: { ...filterVals },
+      queryStr: '',
+      queryStrPrefix: '',
+      queryStrSuffix: '',
+      maxDate: '21/1/2025',
+    }
+
+    const [_tierCalculation, personActivity] = await getPersonActivity(req, res, hmppsAuthClient)
+    expect(personActivity).toEqual(mockPersonActivityResponse)
+  })
+  it('should return the cached person activity data if matching cache exists', async () => {
+    req.session.cache = {
+      activityLog: {
+        ...(req?.session?.cache?.activityLog || {}),
+        results: [
+          {
+            crn,
+            personActivity: mockPersonActivityResponse,
+            tierCalculation: mockTierCalculationResponse,
+            ...filterVals,
+          },
+        ],
+      },
+    }
+    const [_tierCalculation, personActivity] = await getPersonActivity(req, res, hmppsAuthClient)
+    expect(personActivity).toEqual(req.session.cache.activityLog.results[0].personActivity)
+  })
+})
diff --git a/server/middleware/getPersonActivity.ts b/server/middleware/getPersonActivity.ts
index 1bfcdbd5..f05f4f21 100644
--- a/server/middleware/getPersonActivity.ts
+++ b/server/middleware/getPersonActivity.ts
@@ -1,7 +1,7 @@
 import { Request } from 'express'
 import { HmppsAuthClient } from '../data'
 import MasApiClient from '../data/masApiClient'
-import { ActivityLogCache, ActivityLogRequestBody, AppResponse } from '../@types'
+import { ActivityLogCacheItem, ActivityLogRequestBody, AppResponse } from '../@types'
 import { PersonActivity } from '../data/model/activityLog'
 import { toISODate, toCamelCase } from '../utils/utils'
 import TierApiClient, { TierCalculation } from '../data/tierApiClient'
@@ -23,7 +23,7 @@ export const getPersonActivity = async (
   let personActivity: PersonActivity | null = null
   let tierCalculation: TierCalculation | null = null
   if (req?.session?.cache?.activityLog) {
-    const cache: ActivityLogCache | undefined = req.session.cache.activityLog.find(
+    const cache: ActivityLogCacheItem | undefined = req.session.cache.activityLog.results.find(
       cacheItem =>
         crn === cacheItem.crn &&
         keywords === cacheItem.keywords &&
@@ -49,8 +49,8 @@ export const getPersonActivity = async (
       masClient.postPersonActivityLog(crn, body, page as string),
       tierClient.getCalculationDetails(crn),
     ])
-    const newCache: ActivityLogCache[] = [
-      ...(req?.session?.cache?.activityLog || []),
+    const newCache: ActivityLogCacheItem[] = [
+      ...(req?.session?.cache?.activityLog?.results || []),
       {
         crn,
         keywords,
@@ -63,7 +63,10 @@ export const getPersonActivity = async (
     ]
     req.session.cache = {
       ...(req?.session?.cache || {}),
-      activityLog: newCache,
+      activityLog: {
+        ...(req?.session?.cache?.activityLog || {}),
+        results: newCache,
+      },
     }
   }
   return [tierCalculation, personActivity]