i thought we were keeping the pound sterling initially?
here's another funny thought. IF we were to become free of westminster, and subsequently joined the eu within, say 2 or 3 years (not impossible, see for example finland or austria) then we would have a veto on any trade deal between rUK and the eu, assuming a deal by that time had not been concluded (a very real possibility).
conversely, IF westminster got the deal they say they want (free, frictionless trade), then we, as part of the eu, would have the same trading arrangement with the rUK. no?