The difference between Catalonia and Scotland in *domestic* law derives from the differences in the constitutions of their respective states. The difference in how they would be treated *internationally* is a consequence of this. 1/2 https://twitter.com/johnmac303/status/1353357831135748097

But those international consequences would be political, not legal. There is no international law which would oblige other countries to recognise iScotland if they did not find it expedient. 2/2

And none of the countries we would most want to be recognised by (European, North American, Commonwealth) would find it expedient to recognise iScotland if our independence was still disputed by rUK. As @KirstyS_Hughes says, they would stand back.

So the Plan B would work only if it created irresistible political pressure for rUK to start independence negotiations. It would be a high risk gamble.

UDI is emphatically the wrong answer.