This is a 14 year old car so some wear and tear is to be expected. It is low mileage for the year and if it has a good service history and has been owned by you for a sensible period of time this would point to it being a well founded vehicle. £300-400 wont buy you too much in terms of refurbishment unless you have access to a trusted local who can help you out. For example you can reckon on a bumper respray at around no less than £200, if the brackets holding it on have been damaged then of course more. Alloy refurbishment can get pretty expensive depending on the nature of the damage, in fact in some cases it is cheaper to buy a pattern set of rims and fit those. However unless it is done properly the refurbishments can look too evident against the well worn patina of the rest of the vehicle.

Assuming the above I would be tempted to try my luck and advertise it at the price you might reasonably expect before committing the big money. Give it a really good clean up, or even get it valeted, and put a years MOT on it. It is surprising how well a car can come up with elbow grease and suitable cleaning materials. Make sure you clean the shuts, inside the door closures, and polish the glass inside and out, tidy it up under the bonnet, get rid of any nasty niffs - dogs, smoke, get the paperwork together etc etc. It is up to you of course as to whether you accept any offers you might receive but assuming the above and at the right price this would be an attractive for perhaps somebody looking to trade up from their first car at not too much cost.