As far as I know, there was only one. A shame really, because they could have stuck the other half of the Leader pointing the other way on a second one. I believe it eventually went on fire with a number of Leaders on board which were somewhat sizzled as a result.
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), Healey 1000/4 (project)
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.