After 4 1/2 years, I was told recently that I should have tried claiming Industrial Injuries benefit. Apparently, it is not related to typical industrial locations (factories, building sites etc.) but covers all workplaces and work related travel.
The other reason I didn't claim was because I thought it was only applicable to traditional employees. However, it is based on National Insurance classification payments and covers agency workers, people on training courses and some volunteers.
The payments are made by the government and don't impose anything on your employer or replace any negligence claim.
If you think it may be applicable to yourself the forms are not too difficult to complete.