Update index.md

Author: jolumley-nhs

app/book-a-vaccination/2025/12/responding-to-insights/index.md

@@ -15,7 +15,7 @@ The autumn-winter 2025 season for Flu and COVID-19 saw more than 5 million appoi
 
 Monitoring responses to our user satisfaction survey told us that users struggle with:
 
-- matching personal details using the Patient Data Spine (PDS)
+- matching personal details using the Personal Demographics Service (PDS)
 - finding existing bookings to change or cancel
 - understanding co-admin and eligibility requirements
 
@@ -94,4 +94,4 @@ We also added links to the booking complete page, to let users book the other va
 
 ## Next steps
 
-Most of these changes were released on the 11 December 2025.  We will be monitoring our user feedback and analytics data, to understand how these changes have helped our users.
+Most of these changes were released on the 11 December 2025.  We will be monitoring our user feedback and analytics data, to understand how these changes have helped our users.