G2YT 1936 England

The original callsign 2YT was issued in Britain to the Marconi Company for use at the Poldhu Station in Cornwall in the early 1920's. It is also known that 2YT was used by Marconi from his yacht Elettra. G2YT was issued to F. J. Rumary, Redcliffe Bay, Portishead, Somerset in 1936. Then, G2YT was issued to Crispin Redshaw, G4VZ, Dorchester in Dorset, date unknown. Does anyone else have a G2YT or G4VZ QSL card, or any other information on these callsigns?
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QSL card sent to Barbara Dunn G6YL.
Started as a SWL in 1925.
Licensed in 1927 at EG6YL, Britian's first licensed YL.

K8CX Collection