Robson was called up to the senior England squad by coach Eddie Jones on 1 August 2016 for a pre-season training squad. On 30 September 2016 he was subsequently named in the Test squad for the Autumn Internationals, however he remained an unused substitute. On 10 February 2019, Robson made his international test debut as a replacement for Ben Youngs against France in the 2019 Six Nations Championship and later during the tournament he also scored his first try in a game against Italy.