to be honest mate, the 318 isn't really a very sought after e30- especially a 4 door. I doubt you'd be able to get more than Ԛ£500. If it had a lot of Mtech extras etc or was really mint then maybe it could go for nearer 800-900 but most folk are really only after the sport models like the 318iS/convertible/325 sport. Tourings seem to hold their value better too.
gone but not forgotten - Mtech 1 old skool 325i :: current rides- MR2 GT and 318i Touring