Way back on 1979 the jointly staffed but RAF housed and equipped RN EFT at Leeming was struggling with the combination of weather, student numbers and airframe availability/serviceability.
FONAC's staff suggested setting up an EFT flight at Yeovilton using some Chipmunks from Roborough.
Suddenly the RAF found the required assets and we got through on time (helped by a massive improvement in the weather, mostly).
How many Chipmunks could now be pressed into service?