It varied depending on timetabling needs. He taught 1A1 physics upstairs in 1963-4 but the next year 2A1 was downstairs with Denver Martin in 1964-5. Next year downstairs with Cdr Swift. Then upstairs again with Mr Garvey. And chem was vice versa (or wicky-wersy according to Mr Barraclough).
front row, 4 from right, replaced Commander Curry. Various faces apart from John Bowen that are dim memories barely remembered!