That sorta money doesn't even buy you a great GPU these days. Maybe a decent one. And then you only need a little more money for a CPU, RAM, Mainboard, storage and a power supply. And if you're feeling fancy, maybe a case as well.

I love how you specifically say "gaming PC" because I know you and every so-called "gamer" these days have to have some over the top, expensive, overheating, power-sucking pile of trash to run games at ridiculous resolutions/refresh rates with blinding, ugly graphics full of so many garbage lighting effects and muddy megatextures that the game is nearly unplayable.

If you can't run a game on a ~400 UKBucks machine, the game isn't worth playing.