The FTSE 100 is not a reliable indicator because it has loads of multinationals in it. The FTSE 250 is down significantly.
I don't wish to be told off for commenting here, as Gillie says, given the subject. For the last week I've been apologising to my Polish, French, Italian, Belgian, Greek and other friends, colleagues and clients for the xenophobic vote originating from the nasty Farage and his ex-BNP and Britain First members.
Still - it's going to take many years - possibly ten - to sort out trade deals. What was one is now legion. We will have to expand our Civil Service to do it. Of course, our Civil Service is not the same as the EU's Civil Service, normally called "bureaucracy" by the Brexit supporters. Unfortunately, at my age it's unlikely that I'll live to experience the paradise which I've been promised.