I can't agree with one of MSE's "Cards From Hell".
Last month in Spain I was getting 1.22 Euros for a pound as long as this was cash pound notes, Sterling Travellers Cheques were the same rate but a commission had to be paid so more like 1.20.
I took 200 Euros out with my RBS Debit Card & got an effective rate of 1.205, not as good as cash and it cost me in theory a couple of quid but I don't see any reason to lock this Card From Hell up when I travel.