Critics’ choice

Impossible Celebrities (BBC1, 7pm-7.50pm)

Given the fact Rick Edwards’ quiz was promoted to the teatime slot, it was inevitable it would also be populated by familiar faces at some point. And here we are: a collection of well-known folks all doing their best to win £10,000 for charity. Comedian Russell

Casualty

(BBC1, 8.40pm-9.30pm)

The fall-out from the recent tragedy affects the whole department, and Iain confesses to Jan that he could have prevented it from happening but did not. Dylan is reunited with Ciara, who is struggling to control both her own alcoholism and that of a friend whom she has persuaded to go cold turkey.

Cardinal: Blackfly Season

(BBC4, 9pm-10.25pm)

In the firat of a double bill, Delorme and Cardinal connect evidence from a fresh crime scene to the murder in the cave, as Terri’s memories help them make connections between her brother and a suspect. Then, Armed with Northwind’s identity, Cardinal and Delorme race to find him.

thecouriermagazine Kane; Paralympian Tanni Greythompson; actor Chizzy Akudolu; Top Gear’s Rory Reid, and presenter Angela Scanlon hope they have what it takes to win. Masterchef’s Gregg Wallace; Radio Two’s Reverend Kate Bottley, and Strictly Come Dancing’s Anton Du Beke are among the other famous faces trying to give the correct answers.

A Year in the New Forest (Channel 4, 7pm-8pm)

An unexpected heatwave leaves the forest facing its hottest early summer in decades, leading to an invasion of flies and other insects. While many animals, struggle to cope with the intense heat, it proves a blessing for others – not least the forest’s many species of rare butterflies.

8 Out of 10 Cats Does Countdown

(More4, 11.30pm-12.35am)

Jimmy Carr hosts the comedy panel show’s version of the famous words-and-numbers quiz, with regular team captain Sean Lock and guest captain Sarah Millican joined by Roisin Conaty and Rhod Gilbert. David O’doherty presides alongside Susie Dent in Dictionary Corner.