I have worked for years as a car sales man and every car we retail has an �1800 mark up worked into it's price,I know that seems high but some cars need more work than others to get them to a a warrantable standard.If you are cash customer and want the car mot'd, serviced, valeted, fuelled, i'd for begin at a �500 discount if you have no trade in,Do Not Sign On Your First Visit!!!! Get his best price and tell him it's ok but you want to sleep on it,come Monday night when the showroom is quiet he will start to re evaluate how much he wants you to buy a car from him,and probably call you asking you in for a chat to see if he can improve his offer.
If it's a Brand New Car which you shouldn't buy because of the VAT (17.5%)To the Government ,You want mega low rate finance ie.8%flat and free insurance and every accessory available.
If you want to part exchange your car(don't, sell private) you'll weaken your deal and I'd suggest www.********trader.co.uk,but have your wits about you,for scams