Thankyou everyone, especially for the video link. 5 min job, now works a treat. There was some grease on the top of the two rocking contact bars, presumably to help with the rocking and some had migrated down onto the electrical contacts.

Recently my roof does not lift or close as soon as the switch is pushed. Repeated pushing of the switch, up or down will eventually operate the roof.The handbrake switch is working properly.Engine is on. All lights and alarm seem to be working. Any ideas please.