Halifax are the only ones, i have been searching for one, the card can be accepted be taken anywhere that takes a visa, ie booking flights etc. its the best idea yet, its the same as a laser that is you are only spending your own money that you actually have, but can still avail of all the places that take VISA
Only problem i see with it is, how long is it before the payment is taken from your card, Laser is abt 3 days, a Visa i would imagine would be longer, which could result in over drawing, or payments being returned unpaid with heavy penalties!