Hi Chris, I think the ELECTRON card works in a similar way, but is attached to your bank account? The Thomas Cook cards were purchased for £25 per card then you could credit each card with up to £5k. When all the cash had been withdrawn you threw the card away and used another one. The great thing about them was that if you lost it or it got stolen it was useless to anyone without the pin and VISA would replace it within 24hrs. I tried all the travel companies and VISA,themselves, but they thought I was barking mad (not a bad judge of character after such a short conversation!) with no luck. If the ELECTRON does work in the same way it would be as good, if not better.
(Great, we have mice!)