A large number of Road Rail machines are presently being advertised for sale here:

http://www.mascus.co.uk/rail%20road/+/Search.html

By comparing serial numbers shown, these seem to include:

A P Webb - MEC002.

Aspin Foundations - 88 and 91.

D Jones - C81 RNV and Q684 BCH.

Hydrex - 3516, 4568, 4569, 5021, 5022, 5023, 5024, 5030, 5032, 5033, 5034, 5038, 5039, 5444, 5922, 5933, 6141 (probably) and 6142 plus one or two unidentified PC128/138.

L & W Contractors - 110.

Sinbad Plant - 303.

Also shown are two Gator Buggys which appear to be 975040 (ex Lundy Contractors/Torrent Trackside) and 975046 (ex Torrent Trackside).