8pm, BBC One “I think that any self-respecting murder mystery has to have a priest in it ...

” It’s time to meet the paranoid contestants of the third series of Claudia Winkleman’s smash-hit reality game. A former British diplomat, an interior designer with thoughts on the castle (and people’s fashion choices), a bird-watching barber and an ex-soldier nicknamed Barbie are some of the other folks who will become traitors or faithfuls. While they might feel savvier about how the game works, the opening show quickly teaches them to never have expectations.

Winkleman’s mittens might be on, but the gloves are off from the moment they board the steam train to the Highland castle. Hollie Richardson 9pm, BBC One Steven Knight’s rip-roaring historical drama about the special forces unit is back for another blistering series. But it’s now 1943, which means that David Stirling (Connor Swindells) is a prisoner of war in Italy – and it’s time for Jack O’Connell’s hellraiser Paddy Mayne to step up as leader and “whip that unruly mob of his into shape”.

They are stationed in the port of Suez planning their next mission with sights on mainland Europe, but there is also doubt over the future of the regiment. Hollie Richardson 6pm, BBC One Ready? Witnessing Rob Beckett, Louise Minchin, Joel Dommett and Ellie Taylor go up against the resurgent Gladiators may inspire viewers to embark on a similarly demanding January fitness regime. At least co-host Bradley Walsh knows.