WBH648S before being shipped to South America. From left to right are Derek Biddle (cab), Penny Stone (looking through the front), Tony Jones (white T-shirt) and behind him is Jim McDonald (who didn’t stay with EO long). Col Livesey and Linda Banks are standing.
Encounter Overland Archives (1968 - 2001) 
Derek Biddle is behind wheel , Not sure about person looking through front…but doubt its Gerry. Laurence Jones has his head out of the top , Tony seated then I think its John Macalevey ( with the hair )He was in workshops for only 3 months See Enflash July 1978) Linda Banks standing at back.