Yes Emmie lots, I researched til I was purple about this just to be fair and to make sure I wasn't having a knee jerk reaction to my desire to remain a member for the EU.
I came to this conclusion:-
We export 50% of our exports tariff free to EU countries plus we get a say in deciding how Trade rules are drawn up. We do pay £13.1bn to be members however but we get £4.5bn of spending, so that's only actually £8.5 bn for which we get tariff free trade with thre EU etc which will end, and also we are likely to still have to pay for years the way things are looking.
All the Brexiteers jump up and down yelling 'Sovereignty' etc but whilst we're in the EU we trade that word for a place at the table and for global influence which we will not have to the same level once we leave. On top of that we won't be truly independent of the rest of the world, we will still be in NATO, WTO, UN etc, it's just not possible to go back to some sort of glorious independent colonialist era that some seem to dream of, we'll just be the awkward out of it with no influence poor relation.
There are roughly 4.5million foreign workers, including East Europeans, West Europeans and workers from other parts of the world. Overwhelmingly most foreign workers (approx 3 million) are from India and china, so leaving the EU will not cure that alleged 'problem'. In fact it's not a problem, without foreign workers our infrastructure will grind to a clanging halt. We need foreign workers and their Tax revenue. It has put a strain on housing and the NHS, but we cannot do without them, and we need to tackle that problem differently than banning freedom of movement within the EU because that won't help.
The list to be honest, is endless, and the above merely scratches the surface of several pertinent points which make me a staunch Remainer.