AOPA administered the PPL Exams, the Flight Tests and appointed and controlled all PPL Examiners through the medium of the Panel of Examiners made up of FIEs. When the agreement was torn up, control of the Panel of Examiners moved from Capt Paddy King at the Bournemouth Flying Club to the CAA CFE in the Tower. A few years later the Panel faded away.
PPL Examiners used to issue pink chits to candidates when they passed and the counterfoils all went back to AOPA. Rumor had it they all finished up in Ron Campbell's garage! One or two examiners didn't bother!