Joshua trained at the Guildhall School of Music & Drama.

Theatre includes, A Midsummer Nights Dream (Regent's Park) Snow White & the Seven Dames, The 306: Dawn (Perth Theatre and National Theatre of Scotland), The Sisterhood (Belgrade Theatre), Fuse, Romeo & Juliet, The History Boys (Sheffield Theatres), Primetime (Royal Court), How I Learned To Drive (Southwark Playhouse), Stink Foot (The Yard), Unidentified Item In The Bagging Area (Old Red Lion), All The Ways To Say Goodbye (Young Vic), Hansel & Gretel (Dukes Lancaster), Pages From My Songbook (Manchester Royal Exchange), The Way of the World (Chichester Festival Theatre) and Bully Boy (Nuffield Southampton / Royal & Derngate Northampton / St James).

Television & Film includes Jigsaw, Vicious, Preston Passion, Waterloo Road, The Royal, Holby City and Doctors.