Nicola Sturgeon staged her predictable attack on Ruth Davidson and the Scottish Tories yesterday over the fact that the transitional Brexit deal on the EU Common Fisheries Policy, as announced in Brussels on Monday, was a good deal less than had been promised.

There is widespread unease among fishermen and their representatives throughout the UK that instead of this country ending its subservience to the CFP when it leaves the EU next March – as pledged by the Scottish Tory leader and Environment Secretary Michael Gove - it will now not be free of its shackles until the end of 2020.

The air has been thick with claims of "sell-out", "betrayal" and "broken promise" ever since David Davis and Michel...