As mentioned above Max Wall a comedian with a great line in comedy dance and walks (long before John Cleese) played guitar "A nice Martin" as Malcom Price described it to me after he had done a gig somewhere when Max was also present.
If my memory is correct Max Miller "The Cheeky Chappy" also played guitar on occasion in between his off-colour (for the time)jokes. There might even be a film clip of him doing so.

Hoot