How good is the bodywork and hood on it?
If it's in very good condition £2500 at least.
If the hood is ropey and the body isn't great more like £1800-£2000
A nice example of the much less popular 1.6 I know just sold for £2400 two weeks ago. In the same condition a 1.8 would fetch £3000 or close to, but that was in excellent condition.
Fantastic little cars though, a dream to throw around the lanes.
My MGF is currently for sale on mg-rover.org and I think I paid £3 to be a temporary seller.