Busby, born in
Antrim, County Antrim, has been refereeing for over 7 years. He made his
Pro14 refereeing debut on 9 October 2020 refereeing the match between and . In January 2025, it was reported that Busby was retiring from rugby, subsequent to an incident where
Mack Hansen publicly criticised him after a
United Rugby Championship match. ==References==