Shoppers head to Costco for all sorts of reasons, from boxes of giant muffins to five-litre bottles of fabric conditioner.

Everyone’s got their favourites that get them going back time and time again.

And when I took my most recent visit, it looked like they’d all decided to head there all at once.

I was there mainly for two things last Sunday at my local branch in Manchester: the massive packs of Kirkland toilet rolls and bottles of spring water.

I have never known them to be out of stock, but…