[AdamW]

Just push for as much discount as possible. This also includes getting a decent finance rate (if going PCP) i got 4.9% from Newcastle BMW on a 2nd hand M4, although got 4.1% on a brand new car so the overall package actually worked out cheaper

Maybe see if you can get the 5 year service thrown in. some dealers told me they cant do that on a used but Norwich did it for me so im not 100% sure

They always have room to move though. Id be aiming for a min 5% discount but ideally more if you can push it

If you are doing a 3 year PCP, get another dealer to do a quote for a brand new car, sometimes doesnt work out any different (due to rates and GFV)