David Bradley (born 17 April 1942) is the actor who portrayed Jack Marshall on the first series of Broadchurch. As well as this role, the critically-acclaimed actor is also known for portraying Argus Filch on the Harry Potter franchise (2001-2011), Father Gionetti in Exorcist: The Beginning (2004), Arthur Webley in Hot Fuzz (2007), Lord Walder Frey from the HBO series, Game of Thrones (2011-2019), Basil in The World's End (2013), William Hartnell - who played the First Doctor - to celebrate the 50th anniversary of Doctor Who, Professor Abraham Setrakian from The Strain, and for voicing Merlin in Guillermo del Toro’s animated Netflix series, Tales of Arcadia.