I've just asked my OH who works with this sort of thing and he sent me this.
Extract from engadget:
"British expats and international fans of BBC television alike can now stream some Gavin & Stacey to their televisions (past season 1 anyway, which is on Netflix and Amazon Prime Instant Video), as long as they're properly equipped. The global iPlayer app for iPad has been updated with AirPlay streaming (those in the UK however, have no such luck so far) so once users update to iOS 5 and buy an Apple TV box, they're in business."
But you may have to log on to Apple in Spain - something like that????
We use Apple TV at home here in the UK, altho not for TV channels, just to watch iphone videos, films and stuff??!!But I have to say, we're not overly impressed hense we dont use it to simply "watch TV"