I am very slowly working my way through the currently available 2021 Census data and adding it to the site. I've recently added data at the constituency level for England and Wales so I thought I'd take a look at the constituencies with the biggest change in population since the 2011 Census. First, here are the ones with the biggest increases in population
| Poplar and Limehouse | +30% |
| Wantage | +23% |
| Mid Bedfordshire | +23% |
| Greenwich and Woolwich | +21% |
| North East Bedfordshire | +21% |
These are all in London and the South East. There have been a lot of flats built in the two London constituencies, which probably explains the increase in population. I'm not familiar with the other areas, although I guess they may be considered as within commuting distance of London, which may explain their appeal
And now the ones with the biggest decreases
| Kensington | -9% |
| Cities of London and Westminster | -8% |
| Holborn and St Pancras | -7% |
| Dwyfor Meirionnydd | -6% |
| Ceredigion | -6% |
These are split between central London and Wales. I guess the London ones are an indication that a lot of people buy properties as an investment and don't actually live there. I'm not convinced that is a healthy thing to be happening to our capital city.