Having earlier replaced the gear hanger on the Airnimal I decided yesterday the cable also needed doing. Tim at the LBS said the Clarkes kit with 2m of cable would be fine. However the bike requires a full length, 1.9m, outer, and the Clarkes outer was only 1.5m. So back to Tim, who cut a length from his workshop supply. Now it's all fitted and the gears work properly again.