Thanks for your reply.
If there is a clause to say you will contribute to anything shared with the neighbours/maintenance of anything communal, then I'm afraid you are responsible. However, the total cost of any repairs should be divided equally between all of thise properties that use the right of way, and if one of the 8 is still Council owned, then the Council are responsible for contributing a one eigth share.
If other third parties also use it, it would be for you to argue with the Council that the repair costs should also be divided between you all accordingly.
I hope this helps.