According to an EU plan to be presented this week
According to Reuters , the EU prepared the plan, where the Uk would remain in the single market until March 2019 “about”.
That would already be a base to build on, even though we can expect a lot of peacock fighting to be done still before. That probably explains the evening come back of the GBP,
I would suspect we continue to trade the currency with a, albeit fragile, dip bias for now.