SATURDAY

Walking Through Time

8PM, CH4 Following a pilot in February, palaeontologist Tori Herridge returns with a new, three-part series in which she explores exciting events in Britain’s history, using fossils as her guide. First up is a meteorite strike in Scotland.

Casualty

8.50PM, BBC1 Fans of the show have long hoped that Charlie and the recently returned Duff y would turn their friendship into something more – but this week, there’s a new obstacle in their romantic path: Charlie’s high-school sweetheart Gloria.

8 Out Of 10 Cats Does Countdown

9PM, CH4 Guest captain David Walliams sits in for Sean Lock, with Jonathan Ross on his team. They take on Jon Richardson and Joe Lycett. Jimmy Carr hosts, with Isy Suttie in Dictionary Corner.

The Jonathan Ross Show

10PM, ITV Jamie Dornan, who returns as the serial killer Paul Spector in The Fall on BBC2 this week and as the kinky Christian Grey in Fifty Shades Darker next year, drops by for a chat.