You can find out for example how many people over 65 there are in Whittlesey.
You can find the same data for Coates/Eastrea & Pondersbridge.
28.2% of people in Peterborough were born outside of the UK whilst in Fenland
that figure is 11.8%
You can view the mapping system (takes a couple of trial and efforts to work it out)
https://www.ons.gov.uk/census/maps
Another example being the number of ex armed forces personnel are in the Whittlesey area.