…With the uncertainty out of the way, both exchanges can now focus on the future. “Brexit hangs like a shadow over everything,” says Niki Beattie, chief executive of Market Structure Partners, a consultancy. “But the big danger in these kinds of deals is that if you take your eye off the ball, nobody is developing a strategy outside it.” Those plans — and who develops them — are now moving to the top of the agenda for investors and analysts…