Getting your PPL will cost the thick end of £10K, and once you have your license, flying doesn't get any cheaper.
Its like learning to drive. Once you have a driving license, then you need a car. And insurance. And fuel. And services and MOTs and more fuel and then you want to change your car etc etc.
Getting your PPL is relatively simple, it just needs time, money and effort is fairly large quantities. Keeping your license afterwards is the hard part.
So the question is; what will you do post-PPL training? If you go with the majority and give up, then your PPL will cost you c£10K. If you carry on flying then your PPL will cost you a lot, lot more than £10K.