W.H.C. Blake and his brother built the little Bluetit monoplane from Simmonds Spartan Two Seater G-AAGN c/n 14, Simmonds Spartan Three Seater G-AAJB c/n 19 and some Avo 504 parts.
It was built at Winchester, UK, in the mid-1930s, powered by a 32 hp Gnat engine. It is not known if it ever flew.
It survived the war and later became part of the Shuttleworth Collection. Allocated BAPC.37 it was stored at Old Warden.