Heres a link to the Canberra Rally in 1979

http://www.youtube.com/watch?v=2A71UkUpSIw

This vid runs for 50 mins so its pretty lengthy, but its great veiwing, it features mid rally interveiws with Colin Bond and George Fury, worth sittting through if you have an hour over a beer to spare. The Marlborogh Geminis were in this rally, and various assumedly service vehicles for different teams are briefly visible at some points

In terms of service vehicles, there is a White HJ wagon visible in the 'service area' about 5 or 6 mins in, and the tail end of an H series van at 12:51. Its 1979, so if the ebay ad is correct, does that mean two service vehicles should be there? (Not that they would neccecarily be on film of course).. but, they seem to have filmed a fair bit of the event, anyway its a cool segment, so i posted it.