On the High Street, Marks and Spencers if you have one large enough to have a B de C
Order and pay in advance from Travelex and pick up at the airport is a still cheaper option - but the fee that some (not all) debit cards will charge will wipe out any savings.
Still generally cheaper to get it out of an ATM when you get there
thanks dzug. I have a nationwide account and they dont charge anything for ATM transactions. Still would be nice to have a few dollars to fly over with beforehand
The Post Office don't charge commision though you may find that places that don't charge commision will not have as quite a good exchange rate. It's swings and roundabouts.