Miscellaneous
The Prime Minister who had the most children is Charles Grey, 2nd Earl Grey, who fathered 17 children.
The tallest Prime Minister is believed to be Lord Salisbury, who was around 6 feet 4 inches (1.93 m) in height, although Downing Street's own website lists 6-foot-1-inch (1.85 m) James Callaghan as the tallest.
The shortest period between entering Parliament and being appointed Prime Minister was William Pitt the Younger who became Prime Minister two years after first becoming an MP. The longest period of service as an MP before becoming Prime Minister was 47 years for Lord Palmerston.
The longest period of service for a Prime Minister in the House of Commons was Sir Winston Churchill who spent 63 years as an MP.
Read more about this topic: Records Of Prime Ministers Of The United Kingdom