Conceived as an assault breakthrough tank, this design was completed by June 10th, 1943. No complete prototypes were built. However, some parts and components of the AT7 were used in the A39 Tortoise.
AT 7
Nuffield Liberty Mk. V (AT 7)
WS No. 22
OQF 17-pdr AT Gun Mk. VII (AT 7)
AT 7 Mk. II
Ford GAA
OQF 20-pdr AT Gun Type A Barrel (AT 7)
Characteristics are specified for vehicles with crews trained to 100%.