I have seen two Queen 30 ‘s that came out of Prentices, probably early examples. The first Prentice flew on March 31st, ’46. The one-off Proctor IVa with ply-covered wings was the test-bed for the Q50 & Q70. The one-off Proctor VI was built ’46/’47, and was probably also fitted with an original DH.Q30. The Herons were designed around the Q30, but most had the DH (Actually Bristol Siddeley)Q30-2 fitted. The Q32 was a fractionally different engine. I think the RN Herons stayed in service until the 1980’s, so the 30-2 ‘s lasted pretty well in the end.

Flight, 28th February 1946
“Percival Proctor VI – D.H. Gipsy Queen 31”
Maybe so early in 1946 this is only a proposal…