Mise
isle of lucy
I assume her old housemate had a baby, and didn't want to appear arrogant (as most new parents appear by flaunting all the baby crap they've bought), so he bought a bunch of condoms and put them in his trolly, only to deposit them next to the baby food (which was his real purpose for visiting ASDA) as he went about his daily shop. That's what I'm assuming anyway. Because it's more likely that all of this happened than that someone could miss the point of the joke.