In July 2007, Harwood fronted The Sorcerer's Apprentice, a daily reality series following a group of children learning magic at a Harry Potter-style boarding school.

On 13 December 2010 it was revealed on the BBC's Blue Peter that Harwood would be the new presenter on the show, taking over from Joel Defries.

[11] In pantomime, Harwood played Idle Jack in Dick Whittington at The Anvil Theatre, Basingstoke, between November 2005 and January 2006.

From December 2007 to January 2008, Harwood appeared at The Assembly Hall Theatre, Tunbridge Wells as Buttons in Cinderella.

[12] In April 2008, Harwood appeared in a musical version of Beauty and the Beast, as Jangles the court jester, at the Central Theatre in Chatham, Kent.

On 1 and 2 August 2009, Harwood and Gemma Hunt presented a BBC Proms concert at the Royal Albert Hall in London, entitled EVOLUTION!

In 2010, Harwood appeared at the Lichfield Garrick Theatre for their Christmas production of Peter Pan, playing the lead role and co-starring with his father, comedian Barnaby.

In December 2013, Harwood played "Peter Pan" at the Theatre Royal in Nottingham, alongside David Hasselhoff and Su Pollard.