As for the stock market, if the EU insist we adopt their way or the highway we should be bullish and as Togo says, make a run on the markets. Make the first move and obliterate the EU market. Then offer an olive branch and conciliatory systems that work for all and not just the EU.
The LSE should get in pdq because you can bet your last holiday Euro they are poised to do it to us.
Oh and by the way, the black hole in their finances when we leave, will take years to come into effect because we are idiots and have not claimed back our contributions to infrastructure...
And wine etc