After starring in Pasolini's The Canterbury Tales (1972) and the comedy film Four Dimensions of Greta (1972), Askwith played Mike Abbot in film version of television sitcom Bless This House (1972). During filming, Askwith became good friends with co-star Sid James. Other members of the cast included comedy stalwarts Peter Butterworth, Terry Scott, June Whitfield and Wendy Richard. Impressed by his performance, the producers offered Askwith a role in Carry On Girls (1973) which also starred Sid James. Shortly after starring in Antony Balch's Horror Hospital (1973), Askwith was offered the starring role in Confessions of a Window Cleaner (1974), directed by Val Guest. The part had been turned down by Richard Beckinsale, Richard O'Sullivan, Nicky Henson and Dennis Waterman. The success of the film led to three sequels, Confessions of a Pop Performer (1975), Confessions of a Driving Instructor (1976) and Confessions from a Holiday Camp (1977). Although the Confessions series came to an end with Confessions from a Holiday Camp, a fifth and a sixth film, Confessions of a Plumber's Mate and Confessions of a Private Soldier had been planned. Askwith even expressed a desire to direct Private Soldier, but neither film materialised. Plans to shoot a further made-for-video Confessions film in the 1980s also came to nothing, although by this time he was appearing in the poorly received ITV sitcom Bottle Boys (1984–1985). He has also had roles in the soap operas EastEnders, Doctors, Hollyoaks and Coronation Street where he played a holiday tour guide named Aidan. The episodes of the soap that featured Askwith were filmed in Malta, close to the island of Gozo where he lived for many years. Askwith returned to Coronation Street on 11 December 2013 as musician Ritchie de Vries. Askwith published his autobiography, titled The Confessions of Robin Askwith in 1999. In 2000, Askwith starred in the war-submarine film U-571 before having a role in the horror film The Asylum later that same year. Askwith made a cameo appearance in the film Run For Your Wife, released in the UK on 14 February 2013. Askwith also appeared in an episode of Emmerdale in 2015. His role as con-man Marcus Hornby in the TV comedy drama Benidorm was broadcast in January 2016, and his episode of Casualty aired later that year. In 2021, he joined the cast of Channel 5's popular drama series The Madame Blanc Mysteries appearing alongside Sue Holderness, Sally