Which banks in UK offers a prepaid card that works with Apple Pay?

I doubt that any of them do. I don't know, but I suspect that Apple Pay is not intended for use with pre-paid cards. Either way Apple Pay is currently only available in the US and the UK. You'd need an account with an institution offering the service, which generally means you need to be resident in the country, though not necessarily a citizen of it.

tt2

http://www.apple.com/apple-pay/

Since both Credit Cards and Debit are explicit mentioned, and pre-paid cards are not, I would assume they are not taken.

It is, as TT states, only available in the US and the UK. Actual citizenship is not required, however.

No UK banks currently offer Apple Pay on any prepaid cards (as opposed to credit or debit cards).