I believe DD/H stands for Detached Duty, Home Establishment in normal speak on a training course
No. 8 School of Technical Training (Weeton, Blackpool)
RAF Weeton
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Royal Air Force Weeton was opened as the home of No 8 School of Technial Training on 21st may 1940, and the Fabric Worker, Parachute Packer, Metal Worker, Mechanical Transport Mechanic and Motor Cyclist Courses were transferred there. Between 1st July and 3rd July 1940 31 Officers and 754 Men of the Polish Air Force arraived at RAF Weeton, after evacuation from France, Followed by a further 358 Polish personel two days later.
In July 1940, The Fire Fighting School was to transferred to RAF Weeton from Cranwell.
In September 1940 courses for Fitter Armourer and Aero Carpenter began and the trainees at Weeton assisted in the manufacture of the Hurricane and Spitfire parts for the Ministry of Aircraft Production. In December, 1940 the Mechanical TRansport School which had previously been locatedat No 3 Technical TRaining School blackpool moved to RAF Weeton and in December 1941 the M.T. Instructors Course commenced.
Between August 1940 and August 1942 a total of 41,863 personnel successfully passout from RAF Weeton including MT mechanics, Blacksmiths, Motor-cyclists, drivers, Crane Operators and Cooks to name only a few of the diverse trades in which courses were available there.
Between September 1941 and March 1942 the average personnel strength of the Station was approximately 9,000.
In August 1943 the Fire Fighting School left RAF Weeton and the RAF Police School arrived and remained there until moving to RAF Great Sampford in January 1946.
other entries seem to be
AIR 29/501 No. 2 Personnel Despatch Centre Wilmslow 1940 Apr - 1947 Mar
found no record of 9 PDC
301 Maintenance Unit
sorry cannot shed any light on the Seyc
Neil