I said IF 'coloured' IS offensive then 'of colour' is just as bad unless I am missing some connotation about the 'ed'.
Because you're only looking at the words.
Look at Sod's signage from the time.
"Colored" (sic) was appropriated in a certain context, to indicate that black people were not welcome in certain settings.
"of colour" (or "of color") was not.
Logically and being consistent, if the signs in the USA had read "People of colour not allowed", "PoC" might have become a derogatory term instead.
So, what about the 'no blacks' signs in London? Doesn't seem to matter; why not?
Life isn't logical. Also perhaps, "black" is accepted / embraced by black people?

