Maybe someone could pop to the National Archives and have a look at the Miles M-52 files there e.g.
AVIA 15/1968 Miles fighter-bomber jet propulsion aircraft to specification E.24/43: development policy 1943-46
AVIA 28/2560 Combustion system for the Miles M52 project: No.4 augmenter: tests 1946
There are lots of files from Sir Frank Whittle's collection here which might be interesting:
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