Advent calendars are a nightmare when you’re divorced. The kids come back from their other house with days’ worth of unopened Toblerone, which is funny and delicious, after, say, eight years, but tear-jerkingly poignant when the split is very fresh. So, ages ago, I took matters into my own hands, as there was a very real risk I was going to put everyone off Toblerone. I got some little DIY advent kits from Sainsbury’s, thinking I could only fill the days when they’d wake up with me, and they wouldn’t be faced with a........

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