Sir Trevor McDonald will host Countdown for a week to mark the show's 40th anniversary. Sir Trevor will be one of four famous faces taking to the hotseat over the space of a month, along with Floella Benjamin, Reverend Richard Coles and Moira Stuart.
The quiz show was the first programme aired on Channel 4 when the broadcaster launched in November 1982. To celebrate the milestone, the four broadcasters will each take on a weeklong hosting stint alongside resident lexicographer Susie Dent and mathematician Rachel Riley.
Baroness Floella will be up first for the shows running from October 31 to November 4 with TV judge Rob Rinder joining Dent as the guest in dictionary corner. She will be followed by celebrity vicar and Radio 4 presenter Coles the week after from November 7 to 11.
