[1] Blamire was born in Seaton, Cumbria to parents Graeme, a conservatory builder and Julie Tinnion.
[2] Blamire came through the Newcastle Academy to sign a first-team deal, and subsequent extensions.
[3] In November 2024, it was reported that Leicester Tigers have signed Blamire for next season to fill the void left by Julián Montoya's planned departure for Pau.
[6] He was also a member of the squad that finished runners up to New Zealand at the 2017 World Rugby Under 20 Championship.
[7][8] In June 2021 he was selected by Eddie Jones for the senior England team[2] and on 4 July 2021 scored a try on his debut against the United States at Twickenham.