Model Variants (Including Prototypes)
Type 142 - Twin-Engine High Speed Transport Prototype Model.
Type 142M - Prototype Model adopted for development as a light bomber; Ministry specification of B.28/35.
B.Mk I - Initial Production Model; fitted with 2 x Bristol Mercury 840hp engines.
B.Mk IF - Interim Nightfighter Model of which 200 were produced; fitted with specialized radar and ventral machine gun pack containing 4 x 7.7mm machine guns.
B.Mk IV - Main Production Variant; fitted with 2 x Bristol Mercury XV radial engines generating 920hp; 3,297 produced.
B.Mk IF - Nightfighter Model.
B.Mk IVF - Improved Nightfighter Model
B.Mk V - Fitted with 2 x Bristol Mercury 25 or Bristol Mercury 30 engines generating 950hp; 945 produced.
B.Mk VA - Solid nose assembly housing 4 x 7.7mm machine gun array.
B.Mk VB - Close-Support Model
B.Mk VC - Operational Trainer Model
B.Mk VD - Tropical Climate Model
Bolingbroke - Canadian designation for the Mk IV model variant.