Notable credits include Billy Elliot The Musical, Les Misérables, Made in Dagenham directed by Rupert Goold, and Pompidou by Matt Lucas for the BBC.

At the age of twelve Garnham appeared in the original cast of Stiles and Drewe's Honk!

Garnham made his west end debut in Eurovision Song Contest spoof Eurobeat earning positive critical responses, including a Daily Express review, declaring "a stand-out performance from Scott Garnham.

"[2] Garnham played Irish entrant Ronan Corr in a hilarious performance, completed by an all-white outfit and over-zealous use of dry ice.

The performance also earned him a spot in the Les Misérables: 25th Anniversary Concert alongside Matt Lucas, Alfie Boe and Nick Jonas.