[4] He has previously played for St Helens in the Super League, and has spent time on dual registration from the Saints at the Sheffield Eagles and the Leigh Centurions in the Championship.

He initially signed for the Widnes Vikings academy system, before joining the St Helens scholarship side aged 16.

[5] On 25 September 2016, Richardson was named Man of the Match for his performance in the Academy Grand Final victory against Wigan.

[9] In July 2017, having featured just four times in his first season at professional level, Richardson played for Championship outfit Sheffield Eagles through their new dual registration deal with St Helens.

[12] Head coach Daryl Powell said, "He has a sharp rugby mind alongside his ability to kick the ball in a special way both for goal and tactically.

[21] On 9 May 2024, Super League club Hull Kingston Rovers announced that they had signed Richardson on a year-long loan deal.