Gone are the days, Julie, where a dealer would discount a car for a cash payment because of strict rules on the amount of physical cash a dealer can take before informing Inland Revenue and Customs that you are using cash (money launderers beware). The dealer would knock, say £500 off for cash (knowing he could knock off £1000) and pocket some untraceable cash as well as his commission.
This doesn't happen nowadays, especially at a main dealer. If anything, you would get a discount for using Finance as Dealers earn commisson from the finance company for each agreement paid.
This isn't to say you shouldn't get a discount anyway. It's up to you to negotiate a discount though. Tip, if anyone asks me for a discount for cash, I explain as paragraph one and hope that the customer accepts this, quite often they do, often though I end up doing some discount or other to close a deal.
If you think there is more discount to be had, you have to ask for it. Don't expect it to be for cash though...
Jon
You gotta tie yourself to the mast my friend, and the storm will end.