In 1960 Croft became the first Commandant of the Metropolitan Police's Hendon Police College, and was appointed Officer of the Order of the British Empire (OBE) in the 1970 New Year Honours for his successful development of the Corps of Cadets.
Other graduates included Deputy Assistant Commissioner John Bliss (1936–1937), first National Co-ordinator of Regional Crime Squads of England and Wales, Michael Macoun (1938–1939), Inspector-General of Police of Uganda and later of British Dependent Territories, and the politician Sir Henry Calley (1938–1939).
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He joined Midland Bank in 1964 before joining the Metropolitan Police Service in 1965, after his Hendon Police College training he worked in the West End of London, leaving the force in 1969 to sell life insurance for Equitable Life.