Originally ordered by the RAF as KL161 but diverted to the RCAF, Grumpy was registered with the FAA in 1966 as N88972. After serving in the USA as a fire bomber in the late 1960's, she was flown to the UK in 1987, and registered as G-BYDR, she now flies with The Fighter Collection out of Duxford.
This B-25D did not see combat in WWII but served with USAAF and RCAF training units. Having started her warbird career in the UK as G-BYDR, she retains the markings of an RAF Mitchell of No 98 Sqn. The name 'Grumpy' is carried on the port side only.
The reported construction number is credible, making Monino's Mitchell a B-25D-30, US serial 43-3355. It retains its ventral turret, which is rare. Soviet B-25s were based at Monino for some time during World War II.