Just had a mailing from one of the dealers with a 4 year pcp on a new 5-dr m140i for £2k down and £299 a month..... the dealer despoit was over £7k. Seems a good deal!
If they are offering that deal in a general email then I'm sure you could push further. Also 4 year PCP will mean 1 year without warranty + MOT. What is the final payment?