Routemaster buses to drive through a military firing range

Just once a year, a fleet of old London buses are allowed into military lands to take trips to an empty village where no one lives. It is of course, therefore hugely popular.

The buses that run through a military firing range to Imber

Just outside the Salisbury Plain a TfL bus sign shows a curious route, the 23A, that runs once a year, and is the only bus route allowed through the military firing ranges.