In.
It seems like a much better idea to be part of a union with our neighbours than to separate from them. Norway is massively rich thanks to its oil - that's a matter of good luck - best thing to do with oil is leave it in the ground.
As far as I can see most small countries form unions with their neighbours. I know there are exceptions but they tend to be either unsuccessful or massively rich due to the good luck of having lots of natural resources.
Leaving would be like on of the north American states leaving USA; crazy.
The complaint about Brussels bureaucrats is unfair - we have civil servants too - I believe Britain has proportionally more civil servants. It's easy to blame 'Brussels' - well, the people who live outside Edinburgh complain about Edinburgh-centric allocation of fund (Edinburgh trams for example -what a mess - while the 100 mile long A9 remains the most dangerous road in Britain), Caithness inhabitants complain about the imposition of culturally inappropriate Gaelic signs foisted on them by the Highland council which is based in Inverness etc etc.
Nationalism is dangerous.
If Britain leaves EU it might set off other referendums leading to the eventual break up of EU with potentially disastrous consequences.
Many of the arguments in favour of leaving seem to be founded on either fear or greed. Fear of immigration - which is ironic given the number of ex-Brits who emigrated to Canada, America, Australia and Spain. I think immigration is self-limiting anyway. Fear of our national identity - whatever that's supposed to mean 'Curry, Queues and too much alcohol perhaps' being 'taken over' by immigrants.
Sorry but this argument that 'our' waters etc are plundered by Spanish fishermen and we will reclaim them seems like 'We were here first, it's ours and we're not sharing'.