The truth is I am unable to tell you 100% if your Visa card will work in the ATM in Agios Gordios. Please be prepared that it will not ang have a few Euros with you until you are able to use it elsewhere. No Euro's, take some crisp £notes into George at Gee Bees to see you over. As to using your visa card for purchases, NO,NO, NO. Pay local currency in cash. Too many people have had their card charged the Euro value and not the £ value, costly. About 1.5 times more than you expectecd. Card cloning is rife so never let the card out of your sight even for a moment regardless of the excuse. Get Cash from ATM's and pay in cash if you have the right card.