The Great British Bake Off: An Extra Slice Guest cast, played by Richard Osman Episode 4x01: Episode 1 (Aug 31, 2017) Episode 4x08: Episode 8 (Oct 19, 2017) Episode 5x06: Episode 6 (Oct 5, 2018) Episode 5x10: Episode 10 (Nov 2, 2018) Episode 6x09: Episode 9 (Oct 25, 2019) Episode 7x01: Episode 1 (Sep 25, 2020) Episode 9x03: Episode 3 (Sep 30, 2022)