Almost impossible for specialist schemes. But definitely possible for the normal MX scheme. I’m living proof and I know of at least two other batch mates who are in the civil service. Not sure about their salaries but I wasn’t undercut. Was offered 3.5 which is reasonable for a fresh grad 2:1 with no NS.

However, I should add that we got into civil service in spite of our private uni degrees - ie we worked very hard to boost our resumes with quality extra curricular and internships.