Limits are understandable. Over the past few weeks I've seen people loading their carts with paper towels, TP and bottled water.
When my kids were little and they'd start hitting a candy dish at a relative's house, I'd ask them if they thought they could control themselves or did I need to make a rule about it.
Same principle applies here. When people won't control their greed (or fear), stores have to make rules.
@hollydolly, d
on't you think a 3 per customer is sufficient for pasta, alcohols, wipes and TP? Presumably Tesco had some customers overbuying which is why they instituted the rule.