AOG..there were two Chinese sisters, one in my class and an older one. There was a Afro-Caribbean boy called Neil, who was my best friend and there was a young Polish boy, with a surname beginning with Z, the son of a Polish airman, who stayed on after the War.
There were numerous Irish kids, some born in Ireland and some born here...well it was a Catholic School in Kilburn, North London after all.
We had a favourite Teacher, called Miss Wilkinson, who was what I think is called an Anglo-Indian. Her Dad was a British soldier who served in India, and her Mum a local Indian girl. She took us to the famous Robert Mayer children concerts, in the Albert Hall. Lovely lady who first introduced me to serious classical music.
There were other "coloured" Teachers, mostly Franciscan Fathers from India. And of course, lots of Irish Nuns.
I have no recall of any racism in my school. In fact Neil was always a popular lad as he was good at football and to be asked to play in his Team at playtime, was a much regarded honour.
So, quite a mini United Nations ! Hope that answers your question AOG...its an awfully long time ago.