This is a report by the evangelical alliance. It follows on from one in 2015 which you can download here.
The questions have been updated slightly for their 2022 report and you can read all about it here:
(best viewed on a desktop – click on it to go full screen, press escape to exit full screen)
By there definitions they reckon that about 6% of the UK population are practicing Christians, but that over 40% will self identify as Christian. Read the report for the precise numbers and analysis though!
Here are some snapshot of the statistics
It looks like having a presence online where people can find help in their spiritual search is in the top four places people are looking. An active YouTube channel ranks favourably with visiting a building.
Food for thought?
These reports are of course very broad brush, and there will be variations within localities as well as between the nations that make up the UK. See the footnotes in the report for the start of a discussion about this