Just wanted to give you all an update.
My car is now repaired and is good as new. The body shop has done a fantasic job. You would never know it had ever had an accident at all. No paint lines around the doors, boot or bumper seems. Absolutely seemless and flawless paint work.
Cost of work was only £675 so not too bad a price. That included a full repsray of my rear bumper and removal of previous signs of minor reversing accident too - not just the dent removal of the wing and repaint of wing. My insurance company has paid for all of it and waived my excess fee so it didn't cost me a penny. I expect my insurance company will recover all costs from the other insurer without any problems so no effect on my no-claims bonus.
The bodyshop that did the work is in Hook, Hampshire just off the A30 and are called CarTechnicks. http://www.cartechnicksltd.co.uk/ They work with Lamborgini, Ferrari, Aston Martin, Jaguar, TVR and Zeds (the owner had eight 300zxs). I whole heartedly recommend them.