They did, 21 times, and Churchill was the PM when it came out in 1942 and was very non committal in his reaction to it, understandable perhaps because he had other things on his mind at the time but he was definitely not one of the "prime movers"
https://blogs.lse.ac.uk/politicsandp...built-the-nhs/
https://blog.nationalarchives.gov.uk...welfare-state/