Geriaviator and FED (111137 and 138),
I think the Coles Crane was probably "commandeered" for miltary service, and they hadn'nt had time to repaint it and give it a service number.
So just plain old rubber boots, then ("Boots, rubber, gum, airmen for the use of ?") - stores Ref ?
Think there was a medieval statute which allowed draymen to piddle al fresco on the offside back wheel of their cart.
Danny.