There are lots of variables affecting the cost. Think in terms of about £7000 for the PPL.
Yes, it's cheaper abroad but these are intensive courses. You have time on your side so why not start now, take it slow and enjoy it?
I don't see why airlines would prefer UK vs. foreign training, but you do need to do European (JAR) training if you want to fly in Europe, rather than FAA for the US.
Of course, the PPL is just the first step. Think in terms of £70,000 to get to airline standard unless you can pick up sponsorship. Do a search here for "gapan" and "sponsorship".