Transcripts (perhaps draft) of the Article 50 ‘Brexit’ Appeal hearings at the Supreme Court
It is, my Lord, page 18 and MS 10127, and shortly stated:
"As happened in Northern Ireland earlier in the century [he is referring to the period between 1920 and 1972, of course] we would expect a convention to be established that Westminster would not normally legislate with regard to devolved matters in Scotland without the consent of the Scottish Parliament."