Ah yes I forgot about the excess issue and the cat status, fixing your self negates both of those little issues. And as you seem to be leaning toward fixing the bike your self, the best course of action is source good qaulity bits second hand.
The first option that present itself is to replace the firing kit as a whole, @ £400 its a steal as all those bits in that condition would cost a lot more from breakers -
http://foc-u.co.uk/index.php/topic,7798.0.html - incdentaly this chap has two fairing kits for sale. You are then left with sourcing the subframe, the inner panels, the rad guard and a handlebar end. I cant tell from your photos, but did any of the rest of the left hand side get scuffed..?
The only parts(from the list above) I could find on ebay at were a
set of forks - currently at £32, so right now your best of asking on this forum and doing a partfinder (09060300100/http://partfinderuk.co.uk/) and last sometimes you get bits on
GumtreeAh and before I forget Its a little know fact that
you can also claim under the Motor Insurer's Bureau (MIB)'s Untraced Driver's agreement, which allows injured persons to claim for injuries sustained through the fault of untraced drivers. Now as you had man handle the bike into the bushes on the side of the road you will have caused some soft tissue damage. I dont know if you can claim for the damage to the bike or just yourself, but either way you may get some money towards the cost of repairing the bike.