The pound dropped by 1.6% against the dollar after Bank of England stimulus measures in response to the Brexit vote. Gilt yields also fell to record lows as the bank launched a four point plan to reinvigorate the economy. It halved interest rates to a lowest ever 0.25% and introduced an extensive quantitative easing program.

Pound plunges as Bank of England cuts interest rates for first time since 2009 – Telegraph.co.uk