It is unclear if Lyndon Arthur has children or not. He has kept information about his personal life away from the media.
At the regional level, he held the Commonwealth light-heavyweight title from 2019 to 2021.
As an amateur, Arthur had around 50 bouts and fought out of Collyhurst & Moston ABC. He competed in multiple national championships, including the 2012-13 ABA National Development Championships at 86kg, losing out to Jermaine Kelly in the final.
Arthur made his professional debut on September 24, 2016, at the Manchester Arena, Manchester, scoring a four-round point decision victory over Andy Neylon. On December 5, 2020, Arthur defeated Yarde via Split Decision to retain his Commonwealth light-heavyweight title and win the vacant WBO Inter-Continental light-heavyweight title.