However, this one was a completely different matter. Plenty of clearance for the bolt once the brake spring canister was removed, and best of all the cable enters from a completely different angle, so it was a doddle to clip in. If necessary, I could have done it at the roadside without much trouble.
It's now clear to me that there are at least two different arrangements, which would explain why some have found the job fairly quick and easy, and it's been a real pig for others!
Whether this difference relates to the manufacturing year, exact model, or simply variations in bought-in assemblies, I don't know, but I do know which I'd rather repair