Henry is an Olivier award-winning writer and has been a member of Mischief Theatre since 2009.

Theatre includes: The Play That Goes Wrong (winner 2015 Olivier Award), Peter Pan Goes Wrong, The Comedy About a Bank Robbery, Groan Ups, Magic Goes Wrong, Mischief Movie Night.

Television includes: Peter Pan Goes Wrong (BBC1), A Christmas Carol Goes Wrong (BBC1), The Goes Wrong Show (BBC1), Holby City (BBC1), The Royal Variety Performance (ITV).