Thank you Diane!!
As pointed out I started to accept Tesco gift cards for my Cinnamon Trust quizzes last year. I chose Tesco as I live in Cornwall and there are not a lot of the big stores round here - M&S, WH Smiths etc - or the other supermarkets and Tesco is fairly nationwide. Also, they do these cards that are like a credit card and can be topped up with any amount and do not cost any premium to either sender or recipient. This was after I found out how much postal orders cost !!
However, not many people have taken up the idea, those that have think it is great.
I think it has its merits and continue to offer this as a method of payment along with cheque and cash.
Good luck
Julie