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T'other day I was walking and it was hot and I was thirsty. I had 50p in my pocket and thought I'd go see if I could buy something to drink. I didn't have anything else on me.

My expectations were low - I thought maybe, just maybe, I could get a child's carton of juice, if I was lucky. But no, all those were at least 20p out of my price range. A small bottle of water was even further out of reach at nearly a pound for the cheapest.

However, I could buy a 2 litre bottle of own-brand fizzy lemonade and have 11p change.

There's something a bit screwy about that.