Hiya
Everyone of course is going to post that their place/area is the best cos they live there!!!
As already mentioned, your question is impossible to answer - to illustrate, Jimmy911, how long is a piece of string?!
You need to work out what the best place is for YOU and your individual circumstances. You have a family, consider what they want. Then, with that basic criteria, start to research areas of the UK which match those requirements. If an area offers all or probably most of what you'd like, shortlist it and then find maybe 3-4 other places that match that or come close to that. Then go visit or find out which of that shortlist seems to be the best, finally, once chosen, move on with the relocation aspects...
Personally, I like where I am in terms of being right next to the hustle and bustle of London and city life and all that offers, and also right next to countryside and a slower pace whenever I need to slow down a bit. So I'm just outside of the M25 in a place called Slough, right next to Heathrow (my 2nd home - if you look carefully, you'll see a little hut with my name on it in one of the terminals!!)
Good luck - yer have a lot of research to do!
DtM! West London & Slough UK!