To everyone saying that the sterling is dropping because they left the EU, they are not realizing (or choosing to not mention/misrepresenting) two things.
1: They haven't actually left yet, they will still abide by EU rules for two years before they adopt new policies
2: The value of the sterling was dropping before the votes were announced.
In times of political uncertainty, the economy always suffers, this is seen universally across the globe, and at a time like this, there is DEFINITELY political unrest, times are changing after all. Deliberately lumping all the problems onto one side isn't going to make them better, and it definitely isn't going to strengthen your case.
Sorry for this little rant, I just thought it needed to be said.