Hey.
I’m just about to graduate from BSc Psychology at Swansea. Most universities don’t specify subjects that you need to take for psychology but quite a few will offer you reduced grade offers if you do take a science subject. These vary but usually include psychology, biology, chemistry and physics.
I’d recommended that you choose subjects that you enjoy as that’s the most important thing. There’s also no harm in searching university entry requirements of universities that take your fancy.