You'd probably be cheaper going into a main dealer than using your broker. I've just today bought a new E-class coupe using MB's subsidised finance and got a huge discount too (I just asked the dealer to match Broadspeed's price).
For instance, I'm looking at a brochure titled 'Finance Offers from Mercedes-Benz' and the CLS example in there is very competitive:
3.9% APR on their PCP
£6,800 deposit contribution on a £47k car
That deposit contribution is 14% so already beats your brokers' price for the car before you've even started to negotiate. I reckon you can get another 5% discount on top of that offer easily....the deposit contribution is provided by MB so you still have the 8% dealer margin to chip away at
The full offer advertised is as follows (this is just an example and I guess applies to the 350CDi too):
CLS 250CDi - £47,600
MB Deposit Contribution - £6,800
Customer Deposit - £8,935 (you can pay less, right down to zero, or more up to 30%....it just changes the monthly payment)
24 month payments - £399
MGFV/Final Payment - £24,150
Hope that helps
