It's been a wobbly start to the day for the pound 20 May 2016
General euro demand has seen EURGBP up to 0.7712 on a large buy-order after failing to make further progress lower. That move gave GBPUSD a shove down to test 1.4550 after failing to hold early gains above 1.4600.
No particular reason for the GBP weakness but I've been saying for the past few days that the Brexit-poll rally was overdone so we should expect some profit-taking to finish the week.
Currently 1.4570 and 0.7702 and good two-way trading still.