It's still the wrong question (assuming that you don't want to get a PPL just for box ticking and never fly again).
The right question is: how will you pay to keep flying afterwards?
Getting the PPL itself is a one-off capital cost. You just borrow the money. Many people simply wouldn't notice the extra interest from adding £6k or whatever to the mortgage, given today's house prices. Even if your only route to getting your hands on £6k is a personal loan at 20% that's still only around £23 per week interest, and you can get that doing a paper round these days.
So the interest on the capital you borrowed to do the PPL is lots less than you're going to be spending to keep flying.