Sorry guys, I am going to put my head above the parapet and say that I am not a fan of Bovvy. They have had lottery money, lots of it; and the collection is still mediocre.
The French museum at Samur is a much much better day out and the entry fee there is reasonable - unlike Bovvy. For those folks who live miles away, the entry for a year is no benefit. Try bringing the price down by a few pounds and get more families through the door.
regarding the unrestored stuff, why not put it on show (inside or out) people are still interested in vehicles which are not running.
Having said that, I would support a group visit.