If I were to build a PC at a £1000 budget (minus monitor and keyboard/mouse) I would probably go for something like this:
It's on the AM5 platform so it's compatable with future AMD cpus, and I've put in a decent case, motherboard, ram, power supply and storage. The CPU is decent for gaming, while the GPU is decent, but an easy upgrade 2 years down the line if you want to spend more then.
Some others might arrest me and say put everything you can on the GPU, but I'd rather build a good platform and upgrade the GPU at one point if you feel the need.