In reply to Jon Thorne:
Me and my partner are currently travelling Europe and have been for around 7 months now. We have been using an Even Card. It is basically a pre-paid credit card. You add money online and then can withdraw from any cash machine or can make purchases in shops etc like a normal credit card. It works in all countries with all currencies and the exchange rates have always been very good. The card costs £50 per year.
I have money in my UK bank account which I transfer to my Even card as and when I need it
The only thing to note is that it will not work in any un-manned/automatic payment machines, for example toll payments or automatic petrol pumps.