My younger sister joined the Civil Service back in the '80s.
Before she was accepted she had to show that she had never had any allegiance to any political party.
She never told me much about her work except that she was moved from one dept. to another every few years. eg once on historic buildings, once on prisons, once on education.
She married a Scot and ended up in a high position in the Scottish Office, which I expect is a bit different from the English version.
She's retired now, but still won't talk about her opinions on what's going on there or in England.
Her husband is the same, except he will talk a lot about his work connected to agriculture and fisheries within the EU.