Horwood's West End credits include "Spend Spend Spend" and "My One and Only", both of which gained Laurence Olivier Award nominations for Best Choreography. He was associate director and choreographer of "West Side Story", assisted Bob Avian with "Martin Guerre" and was resident director of "Miss Saigon". He choreographed "Hard Times – The Musical", "Calamity Jane", "Tommy Cooper – Jus' Like That" and the play "Six Dance Lessons in Six Weeks", starring Claire Bloom and Billy Zane at the Theatre Royal, Haymarket. He also directed and choreographed "Beautiful and Damned". He directed the Welsh Première Concert Production of "My Land's Shore" for the Gate Theatre in Cardiff. During the summer of 2008, he directed a new production of Andrew Lloyd Webber's musical "Sunset Boulevard" at the Watermill Theatre, which transferred to London's West End at the Comedy Theatre.