Having grown up in Cambridgeshire and excelled at drama in school, Robinson went on to enroll as a Philosophy undergraduate at the University of Birmingham, before putting his studies on hold after successfully auditioning for his breakout role as troublemaker Isaac, in Series 2 of the hugely popular show Sex Education, which launched on Netflix in January 2020.

Robinson quickly became popular with fans of the show for his portrayal of the playful, sarcastic Isaac, who, with his brother Joe, moves into the caravan park where Maeve lives. Masking his insecurities and a developing crush on Maeve with his razor-sharp wit and mischievous pranking, he soon becomes entangled in a love triangle with Maeve and Otis, throwing up some challenging moral decisions for Isaac.

Isaac was also Sex Education's first disabled character, once again restating the show's fresh approach to depicting a multiplicity of characters, backgrounds and stories. Robinson was paralysed in an accident during a school rugby match in South Africa in 2015, at the age of 17.