Hi
A main dealer will not usually have more than £600 profit in a car like this. So if you get more than half that you are doing well.
Visit the car first, find what you like and leave with a saleman's business card.
Email later and say you have thought about it and would be interested if they could knock £300 off.
Make sure you get full warranty cover, that the car has been taxed and serviced. Get it all agreed in writing.
Expect a call back - and be ready to haggle. Just stick to your guns and say you simply can't afford to pay more. And thn wait! If the first one doesn't give you a deal you can always try another garage.
For more negotiation tips, click here.