Trainers

It is still cheaper to buy sneakers in the UK when comparing to mainland Euro prices. Living in Spain has curbed my purchases massively although this is not exclusivly down to price. Availabilty is gash.

Barcelona is fine for trainers. Wouldn't say it's any worse than London tbh. They might be approx 10% more expensive but at least you can try them on in store. Postage from the UK is very reasonable and sometimes even free.