IS there no limit to the daftness of some people when it comes to following trends? An upsurge in middle-class yummy mummies deciding they want to make homemade jam has resulted in burgeoning sales of jam jars.

Empty jam jars. Which this week were being sold in Waitrose (that’s the southern version of Booth’s) for more than the price of actual, full jars of jam.

Apparently, people are too lazy to wash out their used jars of jam, preferring to purchase empty ones instead. How dense can you get?

“The jam jar trend has officially gone mad,” a home design expert was quoted as saying this week. He’s not wrong there. Generations of thrifty housewives must be turning in their graves to see today’s more-money-than-sense shoppers shelling out for empty jars at £2 a pop when full jars of jam can be bought for as little as 40p.

They’ll be selling jars of fresh air to China next... Oh, hang on, someone in Dorset is already doing just that. Really. Heaven preserve us from the stupidity of some shoppers.