To get to the swayers, there's no point in standing talking to someone on the doors whose mind is already completely made up. Activists are few and far between for all parties and there's a lot of doors.
He'll be banking on his canvassers doing better than my MP's:
SL canvasser: I'm here to secure your support for Mr McClymmont (sp?) in the upcoming GE ..
Me: I have no intention of voting for Mr McClymmont
[abruptly cut off at this point]
SL canvasser: Oh, you don't? That's fine, sorry for bothering you.
Standard practice to be fair. SNP canvassers are instructed to do the same, if it's a point blank refusal don't waste time, move on.