No, and I don’t think anyone was suggesting that. I guess the point is, anyone would have a hard time quantifying the variety of reasons that prompted voters to choose one way or the other, especially when there is huge regional / demographic variation. But, yes immigration was a large part of the debate.
Darenager - Ironically, the NHS is hugely dependent on EU migrants, there is a huge shortfall on nationally trained nurses and so most Trusts have gone on huge recruitment drives throughout the EU and further afield (Phillipines) to try and cover the gap. Perhaps paying nurses more would be an idea for solving the recruitment and retention crisis!