Gentlemen, thank you for your input. Although it doesn't answer the original question this is this is a brief summary of the accident:
On 16 November 1960, G-AOUS was written off when the nose wheel was inadvertantly lowered during a routine test flight, leading to a complete disintegration of the airframe; it crashed at Langford Common, three miles south of Biggleswade, Bedfordshire, killing company test pilot, Lt-Cdr J R S 'Jack' Overbury.
DW