What do you want a PPL for?
If it's to tick the box, say to yourself "done that", then move on to the next thing on your list, mountain climbing, extreme knitting, whatever, then you've asked a sensible question to which the answer is around £8k, give or take all the caveats and variations that others are going to add.
If it's for any other reason, like you want to keep on flying after getting your PPL, then it's the wrong question. Anybody can, at today's interest rates, add £8k to their mortgage and not notice the difference - it's not the initial capital cost of getting the licence that's likely to be the limiting factor, it's can you afford £2k/year (or whatever) each and every year thereafter to keep flying.