mostly sterling and some euros.. good time for you guys the US$ is strong and the Euro is in the toilet.. what split you should have depends on the amount of time you spend in those places.. Scotland is part of the UK although they don't like to talk about it. And British pounds are used there.. they have their own notes…
more importantly, make sure your gadgets can take 220 volts or they go *poof*. When I moved back from the US to Europe I actually encountered a few power-bricks in my collection that couldn't handle both voltages :/ Also ATM cards should work almost everywhere - I never had a problem with my cheapo Bank of America debit…