Yes, it's a standard question. I've been asked if I have any guns, even if I have any other weapons. I believe it's part of a standard battery of "risk factor" weighting along with questions about one's residence being built before ~ 1968 (pre lead-paint ban), tobacco use, exercise, exposure to chemicals, one's profession, etc.
Once we're all forced into the national health service, I can only presume that refusal to answer or answering untruthfully to intrusive and non-germane questions such as the weapons question will be perjury.