My own opinion is against a unified European state. Looking at the past human history there was not a single state formed on such a cultural basis that has survived. All of them ended in wars.
Though this point being off-topic it leads to my point about the UK and the prevailing anti-European climate. A country that has got a civil war and two other parts trying to be independent as well, it will not be easy to convince them of just another artificial construct.
Anyway, everything European will meet a lot of hostility in the UK. Guess that's my point. Sorry for waffling on.
Regards, REB