The Rapides that you are thinking of were owned by the Army Parachute Association at Netheravon. The last three went as follows:
G-AGTM sold 08.03.78. Now flying with Air Atlantique.
G-AIDL sold 17.05.77. Now flying with Air Atlantique.
G-AJHO damaged in a forced landing on Salisbury Plain and disposed of 07.10.75. I believe she is being rebuilt somewhere.