These days, if you are in any sort of public-facing role, you need to be extremely conscious of the current thinking on race, which is not what it was in 1956, or even in 2000. That is why I would advocate for anyone in such a role to go on a race awareness course.
It is extremely easy to give offence without meaning to do so. The world has changed so very much.
Having said that, I should mention the ancient English custom called pigeonholing. That is, you ask a series of intrusive and impertinent questions so that you can work out where someone stands on the class ladder.
E.g.
Which school?
Which uni?
What kind of house do you live in?
What job do you do?
What car do you drive?
This may be no more than a variant of the custom. Most people who have attended any sort of gathering with strangers will have faced this sort of thing. Although often, with we northerners, it does not go far, because as soon as they hear your accent they assume you live in a terraced house, own a whippet, and went to a secondary modern.