A colleague of mine likes to cycle. This is a much more expensive hobby than the uninitiated might expect. 600 quid for a set of bicycle wheels. And that’s a bargain. He would come in from lunch with a bicycle saddle under his arm having done a deal with someone on the internet. Anyhow, he made his bike. He brought it into the office one day. Literally, as he felt it wasn’t safe in the garage. I lifted up his super-light, titanium, immensely expensive, fairy-dust sprinkled bike. “It’s not that light,” said I. “Ah,” he said, “you need to take off the water bottle.”