TUI are quoting 62 destinations for the Summer 2022 programme from 16 UK airports, which go on sale November 5.
Cannot help that currently for Summer 2021, they serve up to 21 UK airports, of which 17 are base airports, and that's before the addition of Teesside for 2022.
I would hazard a guess the 16 figure is just the base airports, but that would still mean somebody gets the axe. Reports of flights/holidays for Summer 2022 have already been reported for ABZ, BRS, DSA, EDI, GLA, LGW, MAN, NCL, NWI, STN and the new addition of MME.