I've ordered a 'caxton fx eurocard' and wondered if anyone has used one? You 'load' it with sterling and can use it like a mastercard when abroad. I've seen the post office one advertised but there's fees attached to that one.
My son has a Post Office one and it is free to top it up and free to use in cafes and shops to pay for goods and services abroard, the only fees are when you withdraw cash abroard but some of the shops did cashback for free. He took it as back up incase I needed to get any money to him.