May I add a couple of points for consideration?
Firstly, in order to get your licence abroad, you'll have to add in the cost of return flights to and from your intended venue, plus the costs of accomodation, food and local transport, plus travel insurance, hire car insurances and costs of visas etc. This may serve to wipe out the savings you'll make on the exchange rate and cheaper flying abroad.
My second point comes in the form of a salutory tale. A friend of mine recently went abroad to get a PPL. He ran out of time with only a few hours to do and his flight test to complete. (The wind had got up a bit and was out of limits for students for a few days of his course). The consensus view in the office (where there are several PPL holders) was that he should "finish off" in the UK. He decided, however, to take a weeks leave and fly back to the original club only to come down with a bad cold just as he arrived. Result: a wasted trip. (He did finish off though, at a club in England...) The moral of the story is that if you opt to complete your training in England and you fall ill or the weather takes a hold then you can get on with other things rather than continue to run up costs overseas.