Caunter eventually became Chief Technical Librarian for the R.A.E. after a 1943 transfer and sold his prototype engine to Alvis Ltd., Coventry, for £2,000 after the war.
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Frederick George Miles of the Phillips & Powis Aircraft company (later Miles Aircraft Ltd) built a test prototype of the Caunter engine and successful tests were carried out at Reading Aerodrome in Woodley, Berkshire, during the late 1930s.
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C. F. Caunter was writer-in-residence at Glendon College in 1979, completing his degree there that he started in 1916.