The title of champion, or leading, sire of racehorses in Great Britain and Ireland is awarded to the stallion whose offspring have won the most prize money in Britain and Ireland during the flat racing season. The current (2022) champion is Dubawi, who earned his first title after finishing runner-up multiple times.

Partner was a British Thoroughbred racehorse and sire. He won six of his seven races before being retired to stud where he was the Leading sire in Great Britain and Ireland four times, and continued the Byerley Turk sire-line.