Budget pc (UK)

If I wanted a budget pc (around £400ish) largely for uni work atm but also to play games like DBD, siege and sims what is the best options? Pre built, custom made?

I’m not particularly worried about aesthetics rn just want something cost effective that can run some light gaming. Obviously I’d love a beautiful set up as much as the next girl, but it’s not quite in my budget rn.

Sorry if this is a big ask I just don’t know anything about PCs at all I’ve had a ps4 for years.

-S x