I remember seeeing one of those B25s @ Elstree or West Malling in 1983 or 84.
Taxying to challenge gravity, the right engine stopped at the end of the runway. A few people got out of the aircraft (perhaps a few too many for an aircraft about to display!), had a look around and got back in. They fired it up, took off and did a good display with plenty of smoke from the right engine!