We buy the Aldi version of Soreen malt loaf; I usually have a couple of slices for breakfast.
We usually keep two or three packs in the larder; when I buy new ones, I always place them on the bottom of the pile so the oldest one remains on the top.
When Mrs O takes one out to use, she apparently has been taking them from the bottom of the stack, thinking that's the oldest. I'm sure you can see where this is going .....
Result? We accidentally got down to our last packet today, opened it, and found it's gone completely mouldy!
Use by date was November last year .....