PPL
I wouldn't recomend you do your PPL in Spain, the differene in price is not that big , at least not proportional to the savings of doing an FIC or other modular courses (Spain vs UK).
I would check USA prices, with the savings you still can fly some hours back in UK to polish up your skills and get used to flying in UK airspace.
If you do not mind learning some french you can check prices at french aeroclubs (non profit organizations, so usually cheaper), you'll save quite a lot of money.
Portugal could also be a good option.
Good luck with your training