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Sure - but to the people that they'd actually have to placate were article 50 revoked, I'd have thought that blaming the Scots / Germans / People from That London / whatever would probably be a relatively easy way to say "we wanted to do it, but were thwarted".
Anyway, I mean that you should be able to sell revocation as something other (optically at least) than an action of total weakness.
Arguing that the SNP are at fault for not respecting the "Will Of The People" would be pretty harsh. They represent people who voted to remain in the EU and stand specifically for not representing any other part of the UK.