Claim: After Lionel Beaumont Thomas decided to retire on health grounds in 1933, Cartland was chosen to replace him in Herbert Austin's former constituency of King's Norton, Birmingham; then he won in the 1935 election, and became one of the youngest MPs in the Commons (neither the lower house nor the de facto primary chamber of the Parliament of the United Kingdom).
Evidence: The House of Commons, domestically often referred to simply as the Commons, is the lower house and de facto primary chamber of the Parliament of the United Kingdom.