Main Characters
Recurring Guest Characters
Clare Balding
3 guest appearances
Marcus Chown
3 guest appearances
David Bainbridge
2 guest appearances
Martha Kearney
2 guest appearances
David Ryan
1 guest appearances
Dermot Murnaghan
1 guest appearances
George McGavin
1 guest appearances
Andrew Keen
1 guest appearances
Vince Cable
1 guest appearances
Julian Richards
1 guest appearances
Peter Thompson
1 guest appearances
Geoff Beattie
1 guest appearances
Kirsty Wark
1 guest appearances
Chris Budd
1 guest appearances
Stanley Wells
1 guest appearances
David Crystal
1 guest appearances
John Man
1 guest appearances
Kathleen Richardson
1 guest appearances
Aubrey de Grey
1 guest appearances