At school he joined the 'Gabblers' Club' – a Bristol-based after-dinner speaking society for young students; and, in 2008, was awarded the Gabblers' prize for 'Best Speaker'[11] – a prize formerly awarded to stand-up comedian Mark Watson.[12]
Prior to becoming a professional actor, Forbes worked as a marketing executive, civil servant, computer programmer, web designer, graphic designer and teacher of languages.[17]
The trio began hosting a comedy night called Nova Nova, every other month at the Cockpit Theatre, Marylebone, where they trialled their new material alongside guests, including British comedians Harry Hill and James Acaster.[19]
In February 2016, the BBC announced that Daphne would be bringing a "Goon Show-esque" comedy called Daphne Sounds Expensive to BBC Radio 4,[25] with the first episode airing on 14 July 2016.[26] The series consists of four thirty-minute episodes.[27]
Daphne Sounds Expensive was shortlisted for the 'Best Radio Sketch Show' award at the Comedy.co.uk Awards 2016.[28]Radio 4 commissioned a second series which it would broadcast from 13 July 2017.[29][30][31]
In May 2015, ITV announced that Forbes would be among the cast of their new series Horrible Science, based on the Horrible Science books by Nick Arnold.[39]
In 2021, broadcaster UKTV announced that Forbes would be joining Kemah Bob and Tom Allen as co-host of a new panel show called The Island on its comedy channel Dave.[44] The show was co-created by comedians John Robins, Lloyd Langford, Ed Gamble, and James Acaster. Recording of the first eight episodes began in June 2021.[45]
Forbes is a lover of physical comedy and often incorporates slapstick humour into his routines. He has cited Laurel and Hardy, Charlie Chaplin, Rowan Atkinson, Sir Norman Wisdom and, "most of all", Michael Crawford among his physical influences. "Against all advice," says Forbes in an interview with online blog Comedy Blogedy, "I'd try everything they did at home: bumping into things, falling over, deliberately spilling stuff and – to my mother's horror – throwing myself down the stairs."[47]
Of his sketch group Daphne's debut Edinburgh Festival Fringe show, The List magazine's Brian Donaldson remarked upon a "wild slapstick moment that will hopefully not result in an injury to Forbes before August is out."[49]
Forbes' sketch group Daphne were the winners of the London Sketchfest's prize for 'Best New Act' in 2015.[64] Their first Edinburgh Festival Fringe show, Daphne Do Edinburgh, was critically acclaimed[65] and Daphne were nominated for the 2015 Edinburgh Comedy Award for 'Best Newcomer'.[66][67][68]