Racism was legally sanctioned in the UK. Now it's not. That's also true of the US.
There appears to be very little support in the UK for what its supporters call affirmative action and its detractors call reverse or positive discrimination (based on my highly unscientific sampling). This was true in the US fifty or sixty years ago.
Was the US wrong to adopt it (partly and it appears temporarily) full stop? Was it good for the US (due to more severe problems) then but not for the UK now? Or does greater experience over a longer period of time with proportionately more minorities slowly teach people that it is in some cases the lesser of two evils?
I'm in the last group. Most of what has been good for most people in the US has come from or been in some way influenced by the federal government. Equal rights, collective bargaining, health and safety protection, environmental protection, the list goes on and on. The will of the majority is trumped by the rights of the minority. If this were not so, the majority would quickly arrange a despotic state, as they often have. If any group is denied its equal rights, a central authority ought to step in, as mistake-prone as it may be, to at least try to uphold justice. Whether that's the case as to PL managers I don't know.