To mark Channel 4’s 40th anniversary, iconic daytime show Countdown is set to welcome a string of new faces to the presenter’s chair for a month long run of special episodes.

Countdown is the channel’s longest running show and the first show ever broadcast on Channel 4 when it launched 40 years ago, in November 1982. To mark this special anniversary four eminent broadcasters and Countdown fans, Baroness Floella Benjamin, Sir Trevor McDonald, Reverend Richard Coles and Moira Stuart will join the show as host.

The guest presenters will each take on a weeklong hosting stint, joining lexicographer Susie Dent and arithmetical whizz Rachel Riley on the show. Joining Susie Dent in Dictionary Corner will be criminal barrister and broadcaster Rob Rinder, newsreader and presenter Dan Walker, maths genius and writer Bobby Seagull and actor and presenter Christopher Biggins.

Week One: Oct 31st to Nov 4th
Host is Baroness Floella Benjamin
Dictionary Corner Guest: Rob Rinder

Week Two: 7th Nov to 11th Nov
Host is Richard Coles
Dictionary Corner Guest: Dan Walker

Week Three: 14th Nov to 18th Nov
Host is Sir Trevor McDonald
Dictionary Corner Guest: Bobby Seagull

Week Four: 21st Nov to 25th Nov
Host is Moira Stuart
Dictionary Corner Guest: Christopher Biggins

0:00 Clip 1
0:30 Clip 2
1:28 Clip 3
2:00 Clip 4
2:32 Clip 5
3:02 Clip 6
3:38 Clip 7
4:08 Clip 8
4:29 Clip 9
5:20 Clip 10