What discount can I expect when part-exchanging my car for a Honda Accord Tourer?

I'm thinking of buying a Honda Accord Tourer (59) plate. It's at a franchised dealer for £17,900. What sort of discount if any should I be looking for for a cash deal with no part-exchange?

Assault on battery

I have an Accord Estate with 11,000 miles on the clock. I don't use it every day and sometimes leave it for a week. Up until three weeks ago I had no problem starting, but now if I leave it for more than...