Have stumbled across this site/thread by accident....
I also attended Forest Hill School from July 1964 to July 1971.
I was in Tutor Group Newton 2.
If I remember correctly my Tutor Master was Mr Setram who I think taught German.
I believe that it was a Mr Smith who was the Newton House Master at the time who left and his position being taken over by a teacher who taught Maths but whose name escapes me for the moment.
In my early years I was taught French by a Mr Bowen.
I remember quite fondly Wally Knight who I remember always being very smart 'old school' and having highly polished shoes. He taught me English Literature. I remember a teacher called Abu Hassan (or similar sounding name) who taught English Language at 'O' level.
In later years I was taught Physics by Mr Fenton (the other class had Mr Poole).
I studied Engineering at 'A' Level which was initially taught by Mr Marler.
I recall him taking a group of us down to South East London Technical College in Lewisham Way in his Armstrong Siddely car. I recall that he was quite ill and I think he had to stop teaching and I believe passed away.
The remaining time at Engineering 'A' level was taught by a Mr Riley and later by Mr MacDonald.
With regard to other postings......yes I remember the trips in Margo's double decker buses to Sidcup and undertaking the cross country runs along the Sidcup-Bypass. I remember the initial construction work on the swimming pool at the bottom of the two main playgrounds.
I must see if I can locate some old school reports to see if there is any information on other teachers....i.e. the teacher that used to play the school organ at assembly and taught Music and Art......