Like Plaid Cymru and DUP, SNP aren't a fully national party so I don't think they're represented in that split. Probably equal to LD but wouldn't be representative in overall outcome.
As crazy as it sounds, I would like to see SNP stand in England. I think they have some interesting policies outside of the independence issue. I would consider voting for them.
Where are SNP in that? Other? I guess the proportion of Scottish votes would be pretty small.