Beyond Paradise, BBC1, 8pm

TV divides opinion. That's always been the way. One person's idea of a great hour of telly will be another person's idea of something they'd gladly throw rocks at, were it not for the fact they'd then have to buy a new TV, which would mean wandering around Currys in the usual state of bewilderment, desperately searching for the sets that aren't the size of Spain.

But it's useful to have such clear dividing lines, TV taste-wise, particularly when it comes to us forming friendships. What better way to get to know someone (0r, rather, to decide whether getting to know them is worth the effort, because, let's be honest, forming friendships can be a right old faff) than by asking them to tell you which shows they do and don't like.

As a way to gauge whether someone is fit for purpose, friendship-wise, it's up there with asking them who they plan to vote for. (I do that as well, of course, whenever we have new people over for dinner. Give me the wrong answer and out they have to go, even if we're only on the starters. Sure, it leaves an awkward atmosphere, but it keeps my blood pressure nice and steady and saves on the washing-up.)

TV-wise, I have friends who don't like Beyond Paradise, which returns tonight, and consider it twee. (Sorry, not "have" friends; I mean "had". Obviously those people are dead to me now.)

Beyond Paradise, which continues to star Kris Marshall as DI Humphrey Goodman, with Sally Bretton as his wife when she isn't Lee Mack's, is a cosy crime drama that's pitched just right, and I refuse to listen to any counter argument. The characters are warm without being wacky. The south-west setting makes me want to go and live there (much more than I'd want to live in Death In Paradise-land, which looks way too hot and bitey). And while, OK, people in Beyond Paradise are forever getting murdered, they always get murdered in a nice way.

Tonight a crime writer is actually killed by a fan, just like the victim in his latest and, as it turns out, final novel. Admittedly, the fan is an electric one, chucked in the water while this man is taking a bath, but at least this means we're spared any gore. I do hate murders with gore. It's so unnecessary.

Another week, another fine lighthouse for Rob to visit. This one, at Muckle Flugga in the Shetland Islands, is often called the Impossible Lighthouse, owing to its inhospitable location. To be honest, though, I'm currently kicking myself, because I wrote about this episode very briefly last weekend and joked that Muckle Flugga was what I yelled if I stubbed my toe. Which means I'm not allowed to crack that gag again. Can you imagine how frustrated I'm feeling? No, you can't. You can't even begin to.

Secrets of the Sun with Dara O Briain, 5, 9pm, 10pm

Obviously this is way too big a subject to be tackled in just an hour of TV. So they've given Dara two hours. To keep things simple-ish, he focuses almost exclusively on the Sun's relationship with Earth, particularly on how we came to harness its power. As a comic, of course, he also likes to chuck in some funny lines for light relief. "The star in the centre of our solar system gives us everything," he declares. "But one day it's going to destroy us all." OK, maybe, that one wasn't the funniest.