Segregation of US troops in Britain caused a serious headache for the British. It was an issue raised in Cabinet where it was agreed that
"Nothing [was] to stand between a US officer and his troops; we mustn't interfere" but also "If any segregation US must do it, not us. Explain US attitude and ask our people to pay attention."
Home Secretary, Herbert Morrison, refused to allow British police to enforce segregation, presumably in public places.
Secretary State for War, James Grigg, made it clear that there would be no segregation in British Forces canteens, NAAFIs etc.
Minister for Labour, Ernest Bevin conceded that allowances had to be made for American attitudes and that British officers should be alerted to this, but that this should mean, "educate them, yes: but don't try to educate them into US prejudices."
Secretary of State for the Colonies, Viscount Cranbourne, added further caution, saying the hundreds of thousands of "coloured" British troops from Canada and other colonies rendered the "not too matey principle" difficult. This because these men (and women) were not segregated but integrated into units and formations which might comprise people of several different races.
"If it can be said we have advocated 'colour bar' all the coloured people here from our Empire will go back discontented and preach disaffection," he added.
The British were keen to avoid friction with their principle ally, but were only prepared to compromise to a certain extent. At the end of the meeting it was agreed that a briefing document be prepared to be passed to officers in charge of regiments.
Nobody would pretend that the Britain of the 1940s was a shining beacon of prejudice free racial equality, but attitudes and certainly the laws, were very different from those that came from across the pond.
Cheers
Steve