Why not spread your cost on finance on the over all balance thats left once paid the deposit.
If you take out a finance option there is a 2 weeks up front payment to be made.
Interest Rates are:
8 months 36%
12 months 57.4%
16 months 73.4%
22 months 81.8%
24 months 92.3%
36 months 107.6% This is only available when you spend £1500 or more.