[3] He began playing rugby as a five-year-old at Effingham & Leatherhead RFC in Surrey.

[2] After making an appearance at outside centre against Nottingham in the 2023–24 Premiership Rugby Cup in October,[6] he was subsequently loaned out to Richmond in the National League 1 (third tier) between September and November 2023.

[7] While at the Harlequins Academy Kerr was a part of England U17, U18 and U19 teams for 2022–2023, and toured South Africa for the U18 International Series in 2022.

England won the 2024 U20 Six Nations Championship, clinching the title by table point over Ireland.

[15] Aside from a pool stage fixture against Fiji U20, Kerr started and played every England U20 match, and proved vital in both knockout stage matches, scoring a combined thirty-two points (including one try) in the Semi-finals and Final.