Thanks podgerodge.
Their website is sparse on info. I note the rate (APR) is 8.24%, which seems fairly competitive when looked at as an overdraft or a personal loan. Is there a set up charge? Is there an annual charge (like an overdraft, that you may be paying even though you don't need it anymore)?
Seems like a good idea? (of course if you have the money you should just pay your bills with cash, but this may save you having to set up an overdraft with a higher interest rate and charges if you find you need an overdraft facility)