12/31/2024. Remarks by Johan Visschedijk: "The last of the ninth production batch of fifty Lancaster B.Mk.Is (TW858 to TW873, TW878 to TW911) built by Sir W.G. Armstrong Whitworth Aircraft Ltd., Whitley, Coventry, UK, between July 1945 and March 1946. TW911 was converted by Armstrong Siddely Motors Ltd. for use as a flying test bed for the 3,670 shp Armstrong Siddeley Python turboprop engine. Having the two outboard 1,610 hp Rolls-Royce Merlin 24s replaced by Pythons and fitted with an extra 480.5 gal (1,819 l) fuel tank fitted in the bomb bay, it was first flown in this configuration on January 3, 1949.

Later Avro 694 Lincolns RE339 and RF403, were used in the same manner. The Pythons main use was in the Westland Wyvern naval carrier-based heavy fighter.

TW911 was eventually scrapped, however, the cockpit section was transferred to the Lincoln RF342/G-APRJ.