My apologies for causing offence. I don't see "twat" as a gendered term, and sometimes forget that others do.
However, let's not make this about Tommy. Let's look at the principles.
I'm not against tactical voting as a principle; indeed, I think it's got more going for it than straightforward "representational" voting. I've been involved in "tactical voting" campaigns before. For example, a group I was involved in recommended how best to register an anti war vote in each constituency and list in the 2003 Holyrood general election. But that was a specific campaign with specific outcome in mind.
So, does this come into that category? No, I don't think it does at present. I have several problems with it: the terms are too vague, the suggested support for the SNP too open-ended, and the chances of success as yet ill-defined.
Take it all back a step or two. Before there was a devolved parliament in Edinburgh, the SNP's policy was not to hold a referendum. It was only devolution that led to the referendum policy (for reasons I've discussed before). It used to be that the SNP said their policy was that were they to win a majority of Scotland's Westminster seats, they'd take that as a mandate to start negotiating an independence settlement.
Of course, they never got close. So, that's two problems: what are their chances of success this time? And, will they revert to the policy of "majority of seats = mandate to negotiate"? This last point is important. I think another referendum so quickly would be a mistake for all sorts of reasons. I understand that people are saying that the Vow has already been backtracked on, and it has, but my issue with that is that we don't know how many people would have voted Yes but for the Vow; maybe they're Unionists anyway. So there would need to be clear evidence that the No side has backtracked. Between now and May 2015, there would need to be widespread anger from No voters that the Westminster parties had misled them (rather than from Yes voters!). So some ground work needs to be done there.
However, the advantage of organising around a Westminster vote is that the SNP is not going to form the government in Westminster, unlike at Holyrood. So, their neoliberal-lite policies are actually less of a stumbling block in this case. They would need to, however, base their whole campaign on the mandate for negotiation and the duplicity of the Westminster parties.
Is the Scottish public ready for that, after the 2 year campaign we've just had? And would there be a chance of the SNP winning 30 seats or more. At the moment I'd say the answer to both of those question is no.