My theory is that regulations never have a significant impact on the price unless they can be genuinely restrictive because there are two kinds of people affected by the regulations:
A: People doing legal things with Bitcoin. They'll buy Bitcoin from an exchange, probably verifying their identity, and spend it how they want to in their everyday lives. They won't care about the regulations.
B: People doing illegal things with Bitcoin. They'll buy Bitcoin anonymously from LocalBitcoins or something and won't be tracked by the government. Because the government can't actually find out about these transactions very easily and people will cover their tracks with mixers, they won't care about the regulations either.
So the only effect that regulations would actually have would be how legitimate people perceive Bitcoin to be, but even so it has an audience and isn't relevant to the mainstream. Overall, who cares?
If they do actually go ahead with it, all that will happen is that exchanges switch to the UK and Switzerland, as those places will be outside the EU.
The UK is still in the EU. They've just voted to leave, and it'll happen in a couple of years after discussion and settlements with the EU, if they're lucky.