21 Tory seats in 1983
Also trying to make sense of the Ayrshire and Renfrewshire constituency boundaries.
Boothroyd's map squishes Scotland. The Ayrshire boundaries remained untoched right through to 2005 and broadly untouched in the 1st Holyrood Review. Likewise with Renfrewshire, though Greenock was a seat by itself. Greenock at that time took in Port Glasgow but not Gourock or Cloch. Renfrew West and Inverclyde was therefore as Tory friendly a seat as you could create. Notionally in 1979 it was just Labour. Some have disputed that but given Norman Buchan's personal vote a narrow Labour win could have been likely. It was won by the Tories in 1983 but fell to Labour, somewhat unexpectedly in 1987.