A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
Just an update. Managed to get the fan off (4 bolts). Split the clutch and replaced the oil. Seems to work fine (quite a bit of motorway and a couple of lanes), but will know for definite when towing the trailer round Wales and it is under load.