Fareastdriver - Might be worth a phone call to Cobham Aviation Services at Hern Airport, speak to one of the Business Development guys. CAvS have some brilliant artwork on the walls of the office block which are relics from Flight Refuelling (Ironically FRL DON'T have such art work in their building at Wimborne), I can't say with any certainty that the Valiant pictures they have is the one you are after but they might be able to help you source it??
AA