In the past, Bear Grylls has taken President Obama up an Alaskan glacier and trekked through the Swiss Alps with Roger Federer. This jaunt with David Walliams (ITV) was on a more modest scale, merely requiring the Britain’s Got Talent judge to be dragged across rivers and down rock faces in wildest Devon.

Are brothers Harry and Jack Williams mounting a takeover bid for British TV? They’ve written (among other dramas) The Missing, Liar and Baptiste, and they produced Fleabag. However, judging by their co-writing efforts on The Widow (ITV) they’re spreading themselves thin.

 ITV has an enviable knack for creating populist historical costume dramas which never seem to wear out, despite a million rotations on ITV3.

In the 1970s, the Mancunian stand-up Colin Crompton had a famous routine about Morecambe. He characterised Morecambe as “a sort of cemetery with lights” where “they don't bury their dead, they stand them up in bus shelters with a bingo ticket in their hand”.

As fans of Inspector Morse are well aware, there are plenty of snakes lurking in the grass at our premier seats of learning. In place of Morse’s Oxford, Cheat brings us leafy, picturesque Cambridge, presented here as an agreeable haven of historic quadrangles, relaxing riverside bistros and alluringly wooded suburbs.

The end of series five of Endeavour found PC George Fancy shot dead, Cowley police station closed and the old crew dispersed. With Led Zeppelin on the soundtrack (it’s 1969), the sixth series opened minus WPC Trewlove, but with Fred Thursday demoted and shunted off to Castle Gate police station.

How much more is there to say about the thrills and spills of midlife? Cold Feet made a surprisingly nimble return to ITV a couple of series ago after a long furlough. There was little evidence of stiff joints or saggy bottoms in Mike Bullen’s writing as he welcomed a gang of teens to the cast list.

Bruce Springsteen once sang about there being "57 channels and nothin' on". Those were the days. Now we have so much to watch (including Netflix's Springsteen on Broadway) that all the world's remaining elephants couldn't remember them all.

It was when he was on holiday at his agreeable estate in the Algarve in August 2014 that Cliff Richard got a phone call telling him his Berkshire home was being raided by the South Yorkshire Police. It was the beginning of a four-year ordeal in which accusations of “historical sexual offences” threatened to crush the veteran entertainer, formerly believed to be indestructible.

After seeming to spend an interminable amount of time wandering around in a daze and blundering up blind alleys, Strangers finally gathered its wits and cantered towards the finishing tape with a renewed sense of purpose in the final two episodes.