I imagine we would actually be likely to buy fertiliser by the stone rather than the pound, Bill.

I always find when Americans talk about the weight of some person is pounds I have to do mental arithmetic to work out whether that is heavy or - and I don't know my fourteen times table. Stones is much easier, if you're used to them. And presumably at one time Americans would have been used to them, but abandoned them.

Give me the weight in kilogrammes of course, and it's even worse, because I have to do two mental arithmetic sums, first to pounds and then to stones.