Thanks for the concern guys. Luckily I was the only one in the car. The lad has cut across me exiting a roundabout (from the inside lane) and swiped my front. The car is scraped around the front valance and the alloy wheel is scratched. The engine management light has came on and the traction control light is continually on. The tracking is totally off and the splitter is sticking out an inch at the front. He said he didn't see me, but he was basically trying to beat a que of traffic by flying down the outside, then cutting over. I braked as hard I could avoiding being hit further down the car.
He passed me his details and his boss's phone number. It was a work van for a large electrical company. When I got home I called him and he said he had learnt about the accident but wanted to avoid any insurance claim. I've since called him and told him I'm not happy dealing with it in that way, which I think he was expecting. I'll need a courtesy car, and the damage doesn't look to be entirely cosmetic, meaning I may be without the car for more than a few days.
Bloody typical that something like this should happen so close to Christmas.