Hopefully Dave will return with some more info Steve.
I can confirm though that it is Don Merriman on the right in the Blue Suit.
When that photo was taken - I had been on the OCU for approx 2 months (I arrived mid to late june 1972 as a new J/T 'Rigger' from Halton via a flying course at AST Perth)
Don Merriman was promoted to Sqn Ldr in July 1971 and the seemingly normal format for these OCU pics was to have the Station Cdr or Sqn Cdr standing on the right (as we look at it).
I do remember Dickie Lees and the Nav,although I do not remember any Ethiopian Students,my memory of Studes is quite patchy - so not a surprise LOL
rgds B