[3] At the age of fifteen he joined the academy of London Irish and on 14 October 2017 made his professional debut in a EPCR Challenge Cup game against Edinburgh.
[5] Later that year Loader was a member of the squad that finished runners up at the 2018 World Rugby Under 20 Championship.
[6] On 2 June 2019 he made an appearance for an England XV side in a non-cap friendly against the Barbarians at Twickenham Stadium.
[7][8] In May 2022 Loader came off the bench as London Irish were defeated by Worcester Warriors in the final of the Premiership Rugby Cup.
[9] The following year saw Loader depart the club after they encountered financial issues and in June 2023 it was confirmed that he had joined Stormers.