NFC payments in UK

I've been waiting all this year for Google to bring Google Wallet to UK, they were suppose to launch it just before Olympics, but as we all know that didn't happen. I tried Google Wallet patched Apk and i got about £6 for free to use but you can't top it up easily.

I was just wondering whether they are any other apps available for the UK (not tied to one network or one bank account)

If you are aware of any please share them here.