The cheapest way to get a PPL in the UK was (not sure if you still can) buy an LAA aircraft with a 1 year permit, find an instructor who will teach you full time - £15 an hour for the instructor + £20 an hour for fuel. Total £35 ph X 55 hours. At end of process sell shares in the aircraft making sufficient profit to cover what you spent on insurance and parking. I have seen this done!
Rod1