I’m currently thinking of upgrading my cpu (currently got a i7 7000k, RTX 2080 Super). Platform is used mainly for gaming. I'm in two minds if to upgrade to the i7 10700k or the i9 10900k) £200 in difference between the two.
Any advice would be appreciated.
Honestly, with a bit of an overclock I think your current cpu is fast enough for the RTX 2080 Super already. There are a few titles that benefit from 6 cores / 12 threads, there's not a huge benefit so if you did want to upgrade then the 10700K would be ample being an 8 core / 16 threaded part and I think that should hold true for a good few years (especially given the new consoles are both 8 / 16 designs).
That said, I don't think either makes much sense as a CPU upgrade...