I think you'll find it was the Conservative and Unionist party that had support a long time ago afaik, it was before I was old enough to have an interest in politics.
The last few by elections have been won by Labour, the turnout has been about 30% at the highest, of that Labour have gotten about 1/2 of the vote so that's about 16%. Which has been described as Labour's core vote(a lot of that was postal
). The people of Scotland are rejecting them, just as they have rejected the Tories for being right of centre, afaican see.