Best place to exchange currency?

I would definitely take your money to the bank in the UK. Don't stop at any kiosks. They take a bigger commission.

Consider also using a credit card that doesn't charge exchange fees. This will ensure you get the best exchange rate. I'm suggesting this in addition to carrying some local currency, as not all merchants accept credit.

A monetary unit in Morocco is a Dirham. Banks, hotels, shops has the same rate of exchange ( no difference ). But in the last few years a lot of change agencies openned in the whole country . These lasts give a little bit more. And as you can't take Dirhams out of the country (not considered as a foreign currency yet ) try to change a little by little.

Wait till your in England and a bank would be the best most travel places in america have a terrible exchange rate.