I've already last night had the Green Party folks knock on my door as, I speculate, may have other SD and PW members elsewhere in the UK. We've here in Leicestershire two local Green Party councillors and it's one of them that came calling.
These smaller parties tend to move pretty quick. So yes I was able to let them know I wouldn't be supporting them and why.
BASC needs to be also quick off the mark.
It is too late next week or next tomorrow to publish a "BASC Guide to 4 July Manifestos" if that party's canvassers have already been and gone along your street.