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!