There are a group of pilots who have been flying for years in scotland who won't under any circumstances speak to ATC. They will do there 1 hour with an instructor miles away from where they are based or with one of the Strut/gliding instructors who they have known for years.
They won't turn on a transponder either because last time they did they busted P600.
Instructors/examinors over the years have tried to do the good thing but its completely impossible when they own thier aircraft and have a mate who signs them off and they in the main operate into private strips.