So, started the bike and the fan came on within 3 minutes!
Right, clean the bloody rad before the Wrinklies trip. Might as well get shot of the badly fitting Wunderlich guard and fit the Homebase special at the same time...except Homebase have zero stock. Anywhere
However, Wickes have, as have Screwfix, but about 40p more expensive.
So, off to Wickes tomorrow then.