Immigration, trade deals, cost savings, fishing rights etc etc . These are just side issues to the core of this problem. Do the British people want to be part of a club that gradually subsumes their government, their laws, their sovereignty. And for that club to be ruled by a non elected upper chamber? Most of the people with a voice answered the question and a tiny excess of people said no way, let's leave the club. All of the noise around the other issues is just that....noise, not the reason why the vote went the way it did.