Re: TL;DR
@AC (should really have been Troll icon, but I'll bite...)
Effect on the UK economy: insignificantly small and unmeasurable.
Unless you are one of the 158,000+ job losses already announced, and we still haven't left! And then of course there is the drop in government tax income as GDP falls steadily for a decade or more.
Interesting list at:
https://docs.google.com/spreadsheets/d/e/2PACX-1vTIPx0lI6pb-3Tn-3D6uNJNyKcCd-A8uPMxViagyJAR9T87ZmnSdAEPCzp5ljlNYoUNdxJiJqQdBm7b/pubhtml