Well, it had to happen. Took the wheel off, which was quick as I've had to do it a couple of times. Started with the hub gear cable, to discover I ddn't have a spanner small enough to remove the nut and free the inner cable. There's a spanner at work, so no problem.

Started on the derailleur to find, as I thought, the only way to get the inner cable out is from the back of the cable assembly where it joins the dog leg. At that point, I had to stop, as someone gently reminded me that I had to pick up the dog food from the vet, buy groceries, and cook tea.

On the plus side, it should be finished at some point tomorrow. Not that I'll be taking the bike out tomorrow anyway, since another day has been added to the month long spell of rain we've been having.