From Ray Sturtivant's "Flying Training and Support Units"/Air Britain.
The answer is no.
BAT and DU formed at Boscombe Down 18th September 1939 flying Ansons.
Disbanded 6th June 1940, reformed at Boscombe Down 13th June 1940.
Redesignated "Wireless Intelligence Development Unit" 30th October 1940 flying Ansons from Wyton, to determine the characteristics of German target location beams.
Redesignated 109 Squadron 10th December 1940.
BLEU formed at Woodbridge 16th July 1945.
Ciarain.