After leaving Leytonstone, Corthine played domestic football in Singapore, whilst in the country with the British Army.
[2] In March 1960, Corthine signed for Southend United, scoring 24 goals in 73 league games during his time at the club.
[3] After leaving Southend, Corthine dropped back into non-league football, playing for Gravesend & Northfleet, Chelmsford City, Clacton Town and Ramsgate Athletic.
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