Best Method of payment and is interest free is the following:
Pay on Nationwide Credit Card - no fee for payment and get a good mid rate of exchange
Transfer balance to an interest free credit card for 6 months, paying what you can per month.
After that, transfer to another interest free credit card doing the same.
Its madness to consider finance or loans, when there are so many of these cards on offer. In addition, they give you points etc for doing so.
The critical thing is just making sure you make payments, and transfer before interest kicks in at 6 months.
Free cards at the moment are at least Mint and Egg, and I am sure Tesco's et al offer every couple of weeks