It does not take the skills of a consulting detective to understand the appeal of Death in Paradise (BBC1, Sunday). Sun, sea, and a killing guaranteed - it’s your standard, all-inclusive holiday with a twist.

You don’t get to the 100th episode, as the crime drama did this week, without knowing what the audience wants and giving it to them, throwing in a change of personnel now and then to keep things interesting. Once in the Death in Paradise club - some might say cult - you are in for life; a bit like the mafia.

Tempting as it is, I can never bring myself to seal the deal. The absurdity always proves too much in the end.

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Take this episode, where the case of who shot Commissioner Selwyn was as open and shut as any I’ve seen in a lifetime of telly watching. You will never wriggle out of that, I thought. And of course they did.

No-one in the Death in Paradise club minds because they’ve all necked the special cocktail, but I do, just about. Give it another week of subzero temperatures and I might change my mind.

The sun had its boater on in The Hairy Bikers Go West (BBC2, Tuesday). As Si King and Dave Myers reminded us, they’ve been hitting the road together for more than two decades.

After what Dave called “my recent struggles” he wasn’t sure he would ever be able to ride a bike again, but here he was, two years on from a cancer diagnosis. Their journey began with a visit to Rothesay, a place they had last been 30 years ago.

Scotland behaved itself, laying on some glorious weather and success stories, including Helmi’s cafe and patisserie, run by a Syrian-Scots family, Bute Produce market garden, and Macqueens butchers. Miracle of miracles, there was even a working ferry.

This was a scrumptious hour on all fronts, maybe less so if you were vegetarian (though that salmon en croute was tempting). Now and then Dave spoke about the trials of the last couple of years, how at one point he desperately needed to up his calorie intake but couldn’t eat. A horrible experience for anyone, perhaps more so if your life was built around food. The focus, though, is very much on now and the future. Dave and Si have never been short on enthusiasm but this time they come with an extra helping of joy. Very moreish.

Every time I see Sue Perkins abroad she’s upset about something. Not shouty upset, but distressed to the point of tears. In Sue Perkins: Lost in Alaska (Channel 5, Friday) it was guns that did it. Determined to learn how to survive in the wilderness, she visited a shooting range where the sight of children and firearms almost had her bolting for the door. Fishing, likewise, was spoiled by the sight of a salmon being clubbed on the head. It’s a rum approach to travel, see the world and greet.

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She was on happier ground being attacked by a man in a bear suit. Plus she fulfilled a lifelong dream of walking with a bear, albeit they were separated by a fence, and she drove her car into a ditch. That mishap, and the tears earlier, don’t bode well for the stint in the wilderness, which of course is what keeps us watching. She will have a three-strong crew with her, though. Best pack some handkerchiefs, pet.

One Day (Netflix) could turn Sue’s frown upside down, or anyone else’s for that matter. The film version of David Nicholl’s bestseller didn’t work because the leads were too old, and in Anne Hathaway’s case too movie star glam, to look like university students. Ambika Mod and Leo Woodall are just perfect as Em and Dex, who meet for the first time on graduation day and promise to keep in touch, as is the 1980s soundtrack.

Had to smirk at Boris Becker: The Rise and Fall (STV, Tuesday, STV Player) both for the Carry On-style title and the guidance warning that popped up. “This episode contains sexual references,” it announced. What can they mean? Wouldn’t get that with our Andy, or Roger or Rafa, but Boris has always been a law unto himself according to this two-part profile.

Luckily Pat Cash was on hand to explain where it started to go wrong for the kid who won Wimbledon at the age of 17. Like many who find fame young, “Boris had a lot of people that kissed his arse”, said Cash.

Becker’s ex-wife and others spoke about his charm, but also his arrogance. While they had warmed to him it was a struggle to do likewise, which was not what you wanted when embarking on a two-hour portrait of the man.

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The player himself did not take part, having said all he wanted to in the superior Apple TV+ documentary Boom! Boom! The World vs Boris Becker, by Alex Gibney.

By the end of the first instalment all roads were leading to a certain broom cupboard. You have been warned.