UK Borders Bill

I am still troubled by clauses 1 to 4. Will my hon. Friend authorise his officials to place in the Library this afternoon the advice to which he referred? He said that there were only seven ports in Scotland, but we would all agree that they are pretty major ones. Why do we need clauses 1 to 4 for England, Wales and Northern Ireland, but not for Scotland? If he had said that the Scottish Parliament was going to introduce such a measure, I could understand it; but he did not say that. I want to see the advice this afternoon. Can it be put in the Library?