Bearing in mind I'm not a developer, just been looking at threads/youtube/webpages etc so take what I put with grain of salt.
With a bigger budget in mind...
Intel 12700 reviews below...they both contain the 12900 in there as well... so 12900 top, but cost escalates as well as the power consumption, 12700 k competes with AMD 5900X and 5950X is instances, though for some blender amd outperforms intel, but still would go Intel at mo
https://www.youtube.com/watch?v=vlngwUuDYoc&t=136s&ab_channel=HardwareUnboxed
https://www.youtube.com/watch?v=B14h25fKMpY&t=605s&ab_channel=GamersNexus
https://www.gameplaydeveloper.com/unreal-engine-5-system-requirements/ basically to work on UE5 then you want 64gb ram or more depending what you do, so 2 x 32gb, gives you space to expand then saw below youtube
https://www.youtube.com/watch?v=prAsOtJ3HgU&ab_channel=TechNotice testing DDR5 v DDR4 for creative developers..all system test were 64gb ram..conclusion best bang for buck was 2 x 32gb 3600C18...2 x 32gb 3600c16 was expensive so went with 4 x 16gb 3600c16 which ended up slower than the 2 sticks of 32gb 3600C18...as you can see the 3600c16 much more expensive than the 3600C18...the 64Gb Kingston Fury rgb sticks they used in the vid I've seen for £270 away.....not seen any 3600C16 cheaper in 2 x 32gb than below...for blender he said more ram the better
My basket at Overclockers UK:
Total: £637.68 (includes shipping: £8.70)

Mobo go with a Z690 ddr4 board as z690 supports more nvme storage...was looking at the pro art boards but expensive...they have 2 thunderbolt 4. Ifvu not needed prob look at something like the tomahawk at £259 as run relatively cool with 12900k
Graphics card still looking at..ideally 3090 for the 24gb vram, (so looking at the fe card at 1399 but hard to snag one so alternative......seen a MSI 3080 gaming z trio with MSI spatium 1tb gen 4 nvme for £1053, which for a non fe card, seems a reasonable price in this inflated world
https://www.pluralsight.com/blog/film-games/top-five-gpus-to-power-your-3d-vfx-or-game-dev-system
You could use the 1tb nvme as OS boot drive and if doing serious GB file loads etc would suggest the firecuda 530 2tb for £310, which has a monster indurance or 2550tbw
Psu 850w such as rm850x £129 for 2021 version, but seen rm1000x for £130 so that prob better value, or could just go rm850 for £100 odd and save a bit0)
easy to build in case...and can fit a 360mm aio for the CPU as well as some hhd maybe for long term storage added 011d dvo as spacious inside and should offer everything needed..quite expensive so could find cheaper case so price then drops
Aio 360mm such as arctic freezer 2...£109
Need to start adding up
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My basket at Overclockers UK: