British Pounds to Euro's

[Chrisoldskool]

Hi,

Our friends are getting married this year in Zante (June) and I am wondering if anyone has any information regarding changing our British pounds to Euro's, I have seena few deals on the prepaid card's where you can use them in ATM machines over there, however on the radio this morning and gentleman was saying that any tourists travelling to Greece should avoid the pre paid cards due to the greek economy and potentially not being able to withdraw from ATM's over there, so my question is what/who/how is the best and most cost effective method of changing my pounds to euros.

Thanks In Advance,

Chris