There are plenty of options. Cambridge and Manchester are looking very attractive to me at the moment and there's also the M4 corridor or the south west coast where a lot of financial institutions have a presence.
Moving outside London also gives you an opportunity to shine as London typically poaches talent (plus the blaggers) from the regions and results in less competition elsewhere.
Cambridge is a beautiful city, having grown up there I cannot recommend it enough as a town to live in. However, it's becoming incredibly expensive to live there now, even compared to London. You're not the only one who's wanting to move out of London to places like Cambridge, so the prices have sky rocketed. Add in the ever expanding bio-tech industries and it's a very expensive city now, as are the surrounding towns and villages. There are of course cheap places, Kings Hedges for example won't cost you a fortune, nor is it Cambridge as you'd imagine. However a house on Hills Road or one of the side streets will cost you minimum £1M these days.
In reply to this original thread, trains in...
Italy, horrific, don't bother. The one from Milan Malpensa to Milan central is lovely the rest are ****. Mussolini had taste though, Milan station is a stunning building.
Spain, simular to Italy, minus fascist leaders making nice buildings.
Netherlands, incredible, clean, efficient, comfortable, fantastic.
Germany, A train was once a minute late, I was not impressed. Once on the train much the same as NL.
Sweden, the few trains I've taken were very good.
Denmark, puts the rest to shame.
France, TGV is trés bon, not tried locals, but I imagine they're usually striking so I'd take a car.