In September 2019 he moved on loan to National League South club Oxford City for one month,[10] keeping a clean sheet on his debut.[11] In November 2019 he moved on loan to Wealdstone, also in the National League South.[12] Having won promotion to the National League in his first season at the club, he re-joined Wealdstone on loan in September 2020.[13] However, on 30 November 2020, Isted was recalled by Luton following an injury to fellow goalkeeper Simon Sluga.[14] On 30 January 2021, Isted re-joined Wealdstone on loan for a third time.[15]
Isted made his first appearance for Luton since 2018 in a 3–2 loss to Premier League side Chelsea in the FA Cup on 2 March 2022, coming on as an early substitute for the injured Jed Steer and winning praise for his performance.[16][17] He made his league debut for Luton on 18 April 2022, almost five years since first joining the club, again coming on as a substitute after an injury to James Shea in a 1–0 Championship victory over Cardiff City.[18] Five days later, Isted made his first start of the season and his first league start in a Luton shirt in the 1–1 home draw against Blackpool.[19]
^O'Reilly, Dec (11 September 2020). "Harry Isted returns on loan!". Wealdstone FC. Archived from the original on 15 September 2020. Retrieved 13 September 2020.