The prequel is here to stay. In the end every popular TV drama flogs itself to death. The star wants out, or the writer dies, or the original source material runs dry, or the public falls asleep. And there’s nowhere else to go. Nowhere, that is, apart from back in time. Hence the retro-fitted Endeavour and Gotham and Better Call Saul. In these risk-averse times, the execs enjoy the reassurance that the hard yards of establishing a character have already been gained.

The first series of Broadchurch was a gigantic hit four years ago, though 2015’s follow-up suffered a bit of a slow puncture. Can this third and supposedly final outing restore the show to its former glories?

A screaming comes across the sky. It has happened before, but there is nothing to compare it to now…

There's nothing like a tale set in a warm, exotic climate to lure in the viewers in damp and wintry northern Europe. Send the Nonnatus House midwives to South Africa for Christmas! Shoot a ridiculous detective drama in Guadeloupe! Go back to the Raj with Channel 4's Indian Summers!

The main attraction of this new US sitcom for a UK audience is that two British actors - Stephen Fry and Susannah Fielding – appear in it. The basic premise is that Jack Gordon, a famed reporter, has led a thrilling outdoorsman life, writing about his adventures for the magazine Outdoor Limits.

Historic unsolved murders have become their own mini-genre, with the likes of Cold Case lurking in the small print of the schedules and Silent Witness still going strong in its 20th series. A hit the first time out in 2015, Unforgotten is back with a new investigation of another mystery cadaver.

The most surprising thing about ITV's latest period drama is that they've scheduled it for Monday nights. Since you could soundbite it as a mash-up of Mr Selfridge and Downton Abbey, you'd have thought The Halcyon was a shoo-in for that peachy Sunday-night slot.

So this is Christmas – and what have they done? Scheduled a detective drama that begins with a family being carved up with an axe. Ho ho ho! While Maigret’s Dead Man was no doubt intended to provide a healthy corrective to the festive feel-goodery of Call The Midwife on BBC One, it goes too far. We could have done without the details of torture (a candle-flame to naked breasts) and bloody execution. At least it doesn’t show them (the details, not the breasts).

In the end, what makes a good drama series? It’s probably that you want more of it. This is the end of Cold Feet until a next time which has already been promised, and more is certainly what’s wanted. No one was quite sure if a reincarnation of Cold Feet was a good idea eight episodes ago. Back when the characters were in their 30s the show slowly turned into a bit of a weight round its own neck. Fay Ripley opted out of one season. Helen Baxendale was written out of another. The show began looking under rocks for characters to replace the ones who weren’t there.

One down, eight childbirths to go. The young Queen Victoria was delivered of her first child at the climax of this moreish opening series, and the bells of Windsor tolled for joy. ITV, debutant scriptwriter Daisy Goodwin and biographical consultant AN Wilson will be feeling parental pride that between them they have given birth to a healthy 10-pound whopper that looks very much like the natural heir to Downton.