DOCTOR FOSTER, BBC1, 9pm

THIS series of Doctor Foster started so well, with our demented heroine melting her wedding ring in acid and then filling syringes with the dangerous liquid. But there’s been no mention of those poisonous syringes since, and neither has any spectacular lunacy or wild plot emerged. Compared to the first series, this one seems a bit tame, and it gets even more so tonight when the drama focuses on Tom. Who cares about Tom? We want the bitterness and twisted lust of Gemma and Simon, but tonight’s episode is all about their tedious little son.

The former couple try to unite and be civil to one another so they might work out why Tom is suddenly becoming sulky and violent, but when he goes up to his room in yet another huff, Gemma and Simon are left alone in the kitchen. And then – yikes! Make sure you’re not watching with your granny in the room.

THE GREAT BRITISH BAKE OFF, C4, 8pm

IF you’re still getting acclimatised to all the mad change on the Bake Off then be prepared, because tonight there’s even more: something wild and crazy is going to happen that has never been attempted before … yes, it’s Caramel Week.

If last week’s bread episode was all about the brute strength of pounding, whacking and kneading, then this week is all about sweetness, decadence, salivation and surrender.

Caramel is surprisingly easy to make – it’s really just melted sugar – but it’s devilishly tricky to manipulate as it wants to run and drip and cascade. It also wants to burn you; if you absent-mindedly dip a finger in the pot to have a taste, you’ll probably be in bandages for weeks. You also need to get it perfectly smooth, with no stray granules of sugar floating around inside.

So the idea of Caramel Week is deceptive. We all think: “Sweet!” but the bakers all think: “Oh dear, I want to go home!”