Help me with body armour please

TLDR: I need body armour for chest, back and flank cover. Relatively lightweight. Breathable. I ride parks and trail locally and am UK based.

Long edit.... So, I've recently gotten back into Mtbing after about a 15 year hiatus. I'm now well into my 40s and found out the hard way that I'm not as nimble, flexible or as good as I used to be.

Long story short. Had a bit of an off. Over the bars and chest/ribs to bar etc etc

I'm still recovering but don't want to let it defeat me. I have knee, elbow, fullface already, but would like some body armour.

I'd like chest, back and flank if possible. Relatively light weight. I ride bike parks and trails so need to be able to climb in it without loosing gallons of sweat.

I'm UK based if that makes any difference to recommendations. Thank you.