Shaun has written musicals with A.R. Rahman, Charles Aznavour, Matthew Warchus, Steven Dexter, Maribeth Derry, Lawrence O'Keefe, Guy Kitchenn, Varttina, Leighton James House, Richard Brown, Michael Dunford, Mark Rees and Alister Cameron.
His most regular collaborator is the composer Stephen Keeling, with whom he created Maddie, the Heidi trilogy, The Return of Peter Pan and additional songs for La Cava.