I notice a very natty chequer board finish to the rear fuselage, trials marking for drop evaluation perhaps? And look at the ironmongery in the background, the delicate shape of the Beverly, fins protruding above the skyline and the whistling wheelbarrow there as well, good old days! The old days with no GE, props not lined up, shocking!
As I mentioned way back on this thread I did in fact marshall the first OCU Herc in to Thorney and if the grey cell is working correctly it was 176, the rest following in numerical order.