Kenworth made his debut as a playwright with the premiere of Johnny Song at the Warehouse Theatre, Croydon in 1998.
His second play, Gob, was presented at The King's Head Theatre, Islington, in 1999, and starred Jason Orange of Take That.
The play was also produced by Harrogate Theatre as part of their Festival of New Performance and directed by Steve Ansell.
The play was specially commended by The Literacy Consultancy in their TLC Scriptwriting competition and awarded a free professional critique.
In September 2005 Kenworth had a double-bill script-in-hand performance of Office Guerrillas and Don't Kill The Critic at RADA.