She played Lynn, the faithful but put-upon personal assistant in I'm Alan Partridge, and the vicar's wife Sue in Nighty Night.
[6] Her other television credits include Mapp & Lucia, The Bill, Lovejoy, Health and Efficiency, Wish Me Luck, Tumbledown, Harry Enfield's Television Programme, 2point4 Children, A Touch of Frost, My Life as a Popat, Johnny and the Bomb, Peak Practice, The Queen's Sister, Coogan's Run, Doc Martin, Lead Balloon, Alexei Sayle's Stuff, Skins, Hank Zipzer, M.I.
[12] After graduating from drama school, Montagu was cast in the Terry Johnson play Unsuitable for Adults at the Bush Theatre.
[4] After a long hiatus due to her screen work, Montagu returned to the stage when she starred as Melanie alongside Rowan Atkinson in the 2013 West End production of Quartermaine's Terms at Wyndham's Theatre.
Her credits include Dirk Gently's Holistic Detective Agency, Delve Special, Ayres on the Air, Dial M For Pizza, Old Harry's Game, The Million Pound Radio Show, Revolting People, and No Commitments.