Abbey Zero have recently reduced their 0% transfer period from 12 to 6 months, but still have the 0% transfer fee.
I missed the 12 month deal but my wife go it a few months ago. She did have trouble with the application process though, very frustratingly and rather concerningy, they 'lost' her details for a few weeks and them found them twice. Whole application process from online app form to recieving the card took 8-9 weeks. This included numerous phone calls and cancelling one of the 'duplicated' applications.
I'm considering it but as it's now only 6 months may try the Ulster card instead.
HB.