Also, as someone who has moved country twice (six years in Italy was the first time), I should note that this article doesn't deal with what I can only describe as general UK culture and the British character.
I would strongly advise anyone heading Britside to do what I did with Bucharest and have as long an 'exploratory' trip as you can to get a feel of the place: the way people look you in the eye (or don't); whether you sense hostility; and just the general social atmosphere. You can assess this kind of thing in a couple of weeks, usually, at least at a broad level.
As someone who gladly left, I'm obviously not the person to ask about whether you'd like living there. But it would be a good idea to stay with friends there, if possible, and scout that aspect out for yourself.