Some very interesting points on here, re the various aspects of such a move. But then I found this really daft one, from 'Skate' which said :- "Only one thought - too blinking hot!! Bad enough in the UK on some summer days, but Spain?? No thanks!! The climate anywhere else but the UK would make it impossible to contemplate a move.".
WHAT??? "Climate anywhere else but the UK would make it impossible"? Total twaddle - ruling out the entire rest of the planet due to extremely ill-informed guff re weather patterns?!
Sure, lots of places are too hot, or too cold, but plenty have no more issues than here. Northern Portugal & Spain are on avg just slightly warmer than here, less chance of the cold winter spells we can get, and a higher rainfall that the touristy south, so greener and more pleasant scenery. Holland & Denmark are terrific countries, well organised and civilised, and generally quite grateful to us re WW2. They have very similar weather to here (I've no idea re EU entry issues, I doubt they get many Brits asking?). Further across Europe, northern Italy can get cold, but no worse than here unless you're up an alp. Croatia, Montenegro, etc, wouldn't get the same summer heat as the likes of Cyprus and Malta, winter avgs are fine.
Further afield, sure, Australia is often too hot (and/or humid) but Tasmania is fine, and so generally is New Zealand (the accent may get you though?!).
And across the Atlantic, much of USA and Canada gets too hot, or too cold, but lots of the west coast is perfectly temperate, from the likes of Vancouver and Victoria Island down to Southern California, where perhaps San Diego would be perfectly OK for us Brits.
Oh, and I forgot the Azores and Madeira, perfectly equable for us. And I expect some South Sea islands would be fine too?! Hope that helps.