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A play written in the 1930s by Frank Vosper, People Like Us, was originally banned by the Lord Chamberlain and remained unperformed until 1948 when it premiered at the Wyndhams Theatre, London, in the West End.
In March 2012 she played Angela in the revival of Mike Leigh's Abigail's Party at the Menier Chocolate Factory, later transferring to Wyndhams Theatre, London.
Simon’s Theatre credits include 'Gary' in Unleashed (Hull Truck Theatre Company), 'Lapo' in On The Ceiling, 'Jack Munroe' in Happy Jack (both at The Landor Theatre) 'Rooster' in The Shawshank Redemption (Wyndhams Theatre), 'Gregg' in Waiting at The Lost Theatre and 'Desmond Ainsley' with a UK tour of Bill Kenwrights’ production of Funny, Peculiar.