I have, it was a big pink one, a customer bought it so he could bring all his mates to a party. He wanted it cleaned up a bit. 
I think it was about £50 in and out.
 I used to shoot on the estate, and the bus was the best rabbit hide I had ever used. I could sit on the top deck and shoot out of the sliding windows. Somehow they never worked out that a big pink bus was dangerous.