The Disposals of the Matchless-engined hybrids are interesting. Rather than returned to makers in April 1943, they seem to have gone to Ministry of Supply subsidiary organisations who probably already had a variety of civilian models to look after.
The Enfield/ Matchless went to H.G.T.P. again (at Aberdeen) 9th April.
The Norton/Matchless was handed over to A.O.R.G. Roehampton on 9th April. (The Army Operational Research Group) as was the Matchless /BSA.
The BSA-Matchless went to H.T.P.D. (Home Timber Production Department) at what looks like Perth. 11th June 1943. The frame had an EX prefix.
It's unclear if HGTP and HTPD were actually one and the same...it looks like it from the N.A. records.