Used UK hardtail under £700

I’ve had a few mtb’s in my 20’s but now, at 50, I want to get back into riding. Being in Yorkshire, surrounded by moors and being too fat and arthritic to run, I’d like to get a fun (but not shit) hardtail for around £700. The problem is, they’ve changed since I last had one and there’s thousands on eBay!

Currently looking at a Whyte 805 V4 and an Orange Clockwork Evo Pro but only cos I like the look of them.

Any recommendations of a good used mtb for light fun trails for my budget in the UK market?