Possible Clues:

• Traveller in a vehicle
• One on team doing little effective work
• Old-fashioned rickshaw initially boarded by English traveller
• See 12 Across
• One might travel in a taxi to go green, surprisingly
• Caller ringing head back, a burden to the team
• Col Green's specially cooked fare?
• Traveller in a vehicle driven by someone else
• Traveller's parking rage about slight deviation from south
• 'As a scientist from Farnborough I was expected to be a —, useless in the woods' (Nevil Shute, No Highway)