Theatre includes: The Shadow in the Mirror (Sonning); A Knight's Tale (Manchester Opera House); The Mirror and the Light (Gielgud Theatre); Witness For The Prosecution (West End); The Oyster Problem (Jermyn Street Theatre); Wonderland (Nottingham/Northern Stage); Shakespeare in Love (UK tour); King Charles III (UK tour & Sydney); This House (National Theatre/West End/Chichester); Twelfth Night, A Christmas Carol, The Two Gentlemen of Verona, The Merchant of Venice, Talk of the City (RSC); Wolf Hall, Bring Up The Bodies (RSC, West End & Broadway); An Ideal Husband, The Way of the World, The Music Man (Chichester); After The Dance (National Theatre); Travesties, The Importance of Being Earnest, (Birmingham); The Wizard of Oz, The Secret Garden (Leeds/Birmingham); Blithe Spirit (Nottingham); Waste (Almeida); Othello, Relative Values (Salisbury); Longitude (Greenwich); The Duchess of Malfi (Stoke); Macbeth, Lady Be Good, Twelfth Night, Cymbeline, HMS Pinafore, Much Ado About Nothing, The Pirates of Penzance, A Midsummer Night’s Dream, The Merry Wives of Windsor, A Funny Thing Happened on the Way to the Forum (Open Air Theatre, London); Neville’s Island, Dreams from a Summer House (Newbury); Whenever (Scarborough); Summer Lightning, Dangerous Corner (Northampton).

Film & Television: Tom and Viv, Orlando, Victoria, The Musketeers, Mr Selfridge, Foyle’s War, Stuart: A Life Backwards, Stephen Poliakoff's Friends and Crocodiles, Sentenced, Karaoke, Wycliffe, Lindsay Anderson's Is That All There Is?, Scarlet and Black, The Princess Switch.

Also a Verse and Rhetoric Consultant, Giles has worked on Dido, Queen of Carthage for the RSC and Antony & Cleopatra for Shakespeare's Globe. His book – Dramatic Adventures in Rhetoric – co-authored with Philip Wilson, is published by Oberon Books.