Hallett was born in Southend-on-Sea, Essex and grew up in Leigh. He began playing youth rugby for Southend, and continued his education in the sport at New Hall School, under the tutelage of Tom Taylor, before joining Saracens in 2016.[2]
Club career
Hallett was recruited into the Saracens junior academy aged 16 and played in the Under-18s Academy League during his first year.[1] Injury ruled him for much of the 2017–18 season, but following his recovery, he featured for the Saracens 7s side in various tournaments, which included success in the Premiership Rugby Sevens Series.[3] Hallett graduated into the senior academy in 2019 and made his Premiership debut a year later, at the age of 20, as a substitute in a 40–17 victory over Exeter Chiefs.[4] In the subsequent two seasons, he was dual-registered with both Saracens and Ampthill, making appearances for both in the Premiership, RFU Championship and Premiership Rugby Cup.[5]
Prior to the 2022–23 season, Hallett was promoted into the Saracens first-team squad.[6] In his first competitive appearance as a full-time senior player in September 2022, he scored his first try, after coming off the bench during a 41–39 win against Gloucester.[7]
International career
Hallett represented England at numerous age-group levels as a teenager, including U16s and U17s.[2] Among his notable appearances was being called up to the England U18s squad for their tour of South Africa in 2018.[1]