Can I get detailed explanation with answers?

In June 2016 a referendum in Britain to leave the European Union unexpectedly passed. The next day, the pound depreciated from $1 ,45 to $1.30. There was no change in interest rates in the US or the UK. What could explain this depreciation of the pound when interest rates did not change? Use a diagram of the FX market in your answer, with the UK as the domestic country, and label the axes correctly