I think that will depend on the constituency - you have (if you don't mind me saying so) the luxury of getting either an SNP or Labour MP. I know you don't like either, but I think you'd like either a great deal more than you'd like a Tory - but you know that whatever else you'll get, you're not going to get a Tory, and I imagine a LibDem is almost as equally implausible.
I don't have that choice, I either vote labour, or I'll get a Tory (mine is a no mark who was sacked by Theresa May for pesting, and who has been earning £100k on the side every year) I can well see apathy being a thing in places where they simply weigh the not-a-tory vote, but in places where if you don't vote Labour or LibDem, you'll let the Tory back in, i doubt that so many will choose (quite legitimately...) to watch Netflix instead.