One thing about sitting with your nose pressed very close to a book of legislative clauses for three weeks is that it gets you thinking about some of the more arcane bits of what is in front of you. There are several - ahem - fairly obscure bits of the upcoming legislation that I think are really going to cause trouble in the future - policy implications apart, which I may well set out for your delight in the near future. But for starters here's a continuing puzzle about how capacity payments are going to be viewed in the Energy Bill.