Canberra identities for GK430
I only just saw your post dated June 2007. Maybe someone has already identified the Canberras you ask about, but just in case:
WE137 is an early PR3 (tip tanks were often carried).
WD933 is the B2 Sapphire test-bed, hence the P for Prototype.
Both WH713 and WD952 were B2 Olympus test beds used at Filton. Your photo is I think of WH713, as WD952 had the standard black and grey bomber colours. WD952 was the holder of the world altitude record in 1953.