Hi Henk,
according to http://www.davidsiddall.com/testflyingmemorial/1940-45.htm:
DATE: September 17, 1940
TAKE-OFF POINT: Christchurch, Dorset
CRASH LOCATION: Longford Castle (Salisbury), Wilts
AIRCRAFT TYPE & SERIAL: Bristol Blenheim Mk IV P4830
CREW FATALITIES: Sgt T. Budden, P; Capt P.J. Fulton; Lt R.A. Jefferies
PURPOSE OF TEST FLIGHT: Aircraft acting as target for AI-equipped Beaufighter. Two officers from 2nd Battalion Lancashire Fusiliers on board to observe South Coast beach defences
ACCIDENT DETAIL: Starboard engine failed, control lost whilst attempting forced landing
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