I was at the Becket in the early 1970s.
Engineer and others above got it pretty much right.
Some adds and a few repeats:
Mr. Harrington, Physics and a much younger Physics teacher whose name eludes me -- Mr. Moore?
Fr. Aquinas wasn't the partially deaf Bio teacher it was another man... his name escapes me but he was bald, tall and I remember a nickname "Shiner" -- Mr. Mollison?
Vic Taylor for history -- he left and went to Christ the King comp.
Mr Rayner (short term) for history.
Ken Fearon for Greek (and chess)
Mick Turney for Latin
Brian Quinn for