However, I can find limited evidence it was ever called Cormont Road School. Is there anywhere online I could look or would I need to delve deeper into the archives.
web search on "cormont road school" gets a few results but also haven't found anything definitive.
photo of the group of schoolmasters feels pre 1914 (or possibly a few years after 1918 if they were a really old fashioned bunch), photo of (class?) E8 looks more 1950s.
I have a 1957 Lambeth Borough guide book. Schools were run by the London County Council not the boroughs, so it doesn't list individual schools, but there is a mention of the Robert Browning Men's (Junior) Institute at Cormont School, SE5. Don't think I have anything LCC to hand that lists individual schools.
It was not unknown for the LCC to change the purpose and name of school buildings depending on population changes, opening / closing of other schools (and emergency arrangements following bomb damage) and after 1945 if particular sites got re-developed. The primary school I went to (in Lewisham) had been built as a secondary school and changed both name and status later.
Also was not unknown for LCC to have two (administratively) separate schools on the same site - I can find a suggestion (again in the case of my old primary school) that at one point one building was primary and another secondary (one was an adult education centre when I was there, but think both are now used by the primary school.) Also, one school could have two sites.
1911 London suburbs directory for Cormont Road -
think the 'LCC School' and St Gabriel's College may be two separate entries - they seem to be 2 separate buildings (1914 OS map
here) and a couple of things I've found online may be confusing the two. OS maps from pre-1914 and early 50's just show 'school' rather than a school name.
no mention of either in the 1919 version (the latest currently in public domain) but found a reference to the building (or one of them) being used by the war office in (and presumably for a short while after) the 1914-18 war
1951 phone book (these are on 'Ancestry', and my local library allows remote access) muddies the water further
There was a school building (site since redeveloped) in the middle of the triangle formed by Cormont Road, Halsmere Road and Calais Street (1950-ish OS map
here) -
1919 London Suburbs Directory lists this under Halsmere Road (not Flodden Road) as Kennington Secondary School for Girls - it may be that the site of the house shown as 'ruin' (probably bomb damage) on the 1950 map was bought by the LCC to form a new entrance off Flodden Road.