Barney
I agree that you should go all out to get fair compensation. Look at it this way, if you had caused the problem then somebody would be very quick to seek the same from you.
If you have the manufacturer's admission of liability in writing then that's a good start. You can then build your claim with medical reports, written evidence of business/income lost and damage to reputation/stress/confidence (all impact on your earning ability), also sleepless nights/shouting at the cats. Can your PL company provide details of any legal support similar to when you claim for injury through your car insurance? Haven't used one myself, but some of the "no win no fee" companies who advertise on TV may handle this type of claim.
When I claimed for whiplash it certainly opened my eyes to just what you can list as affecting your normal life as a result. The doctor (not my own) examined me then asked a lot of work-related questions, was I still able to do normal tasks like washing-up, dressing, housework; he even asked if my sex life had been affected! The solicitor was provided by the insurance company. The guilty party's insurer tried to blame for stopping at the junction.....
Good luck Barney. Yes, you may have to do a lot of the work yourself but there's nothing wrong with seeking rightful compensation not only for injury, but lost earnings, stress, etc. Realise your problem is more serious so apologies, I may have stated the obvious above.