The recent break to the upside from a wide triangle formation has seen a significant, but common, pushback which seems to be headed back towards the line of breakout. A touch of the 200 day MA seems in order and then a test of the support area around 1.435
The Pound could break through support and head back down into the channel, targeting the 0.618 fibonacci extension from the possible corrective ABCD-like pattern that would form. In general, given the "brexit" hurdle I think it is plausible to assume a push down of the pound heading towards the vote, the outcome of which will certainly have the last word on the sterling's destination (and the euro for that matter).
Alternatively, a strak of weak US economic data and a continued dovish stance from the FED could cause the pound to bounce on that support and continue it's uptrand.