In 1999, Appleton returned to the UK, where he scored roles on Sky's Hot TV (2000), Five's House Doctor (2000–2003), BBC Two's Rhona (2000), the Travel Channel's Travel On (2001), BBC One's Garden Invaders (2001), Cash in the Attic (2002–2005), BBC Food's Stately Suppers (2005), and had an appearance as himself on the 2006 Doctor Who episode Army of Ghosts.
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It has been speculated that Davies loosely adapted elements from The Flood in his later DW storylines The Parting of the Ways and Army of Ghosts (in particular the Doctor absorbing the time/space vortex to save Rose Tyler's life, triggering his regeneration and the ghost-shifting infiltration of The Cybermen on an unsuspecting public)
He has appeared in numerous television dramas including Doctor Who, Murder in Mind and Casualty, and is also the voice of DJ Panjit Gavaskar (Radio Del Mundo) in Grand Theft Auto.