He played Marvin for two national tours of The Hitchhiker's Guide to the Galaxy including the Rainbow Theatre in 1980 and at the opening of the Drum Theatre, Plymouth in 1982. He also appeared in the 1981 BBC TV adaptation, but only in costume providing the movements for Marvin. Stephen Moore, who played him on the radio series, was brought back to provide the voice. Learner later appeared in the documentary "The Making of Hitchhiker's Guide to the Galaxy" to reminisce about the filming of the show. In 1990 he appeared in The Satellite Game for BSB, playing the host Larry the Robot. It was during this time that he met Knightmare producer Tim Childfor the first time, which led to a successful audition for the role of Pickle. Learner later said in an interview, "I thought I was only going to do one series, I ended up staying for three." Learner played the wood elf Pickle on Knightmare from Series 4 to 6. His role was to help out teams and to provide comic relief. Pickle sometimes broke the rules, by sneaking food into the Dungeoneers Knapsack and famously stepped into the game during one episode to fend off an enemy attack against a contestant, which infuriated Treguard. After leaving the series, his part was replaced with a female Arabian genie called Majida played by actress Jackie Sawiris. In 1997 he played the villain Belial in the video gameRealms of the Haunting, and appeared in The Famous Five episode "Five Have a Wonderful Time" playing Alfredo, the Fire Eater. Learner retired from acting in 1999. In 2001 he presented a Sunday afternoon show on X-CEL FM. He pursued a career in sales and marketing and became a marketing executive for Alliance in Bury St Edmunds. On Sky 1 in 2004 Marvin the Paranoid Android came 7th in a poll counting down the "Top Ten Sci-Fi Robots", Learner was interviewed for it along with actors such as Robert Llewellyn and John Leeson. On 9 May 2013, he appeared in a Script in Hand performance of "The Beau Defeated" by Mary Pix as part of the Restoring the Repertoire project run by the Theatre Royal, Bury St Edmunds. He played the part of Mr Rich. In 2017, Learner provided the voice of Cyril the Farmbot and the narrator in a live-action pitch trailer for '', a comic book series written by and illustrated by .
