do you have your own bag with you today?

It was with only the tiniest hint of accusation that the woman behind the till in Sainsbury's asked me this. Actually it's the first time I've heard it put like that: you must be more likely to say yes to this question than no to 'Do you need a bag?' Proud to say, I did indeed have space in another bag. Every little helps, we agreed, in spite of that being Tesco's slogan; she should technically have said, Try something new today. In fact (or so she implied anyway), I've just gained us 500 years longer as a planet by making this choice. Good to know eh!