No official coalitions for the SNP

This is significant:

The SNP will not do any deals after the election to prop up minority Tory or Labour administrations, SNP business manager Bruce Crawford declared today.

In an interview with The Caledonian Mercury, Mr Crawford – who is effectively the SNP party chairman – explicitly ruled out any formal post-election coalition pacts at Westminster.

Mr Crawford said the SNP block would operate on an “issue by issue” basis and would not get involved in any official coalitions, even if Labour offered a referendum on independence as an incentive

...removing the SNP and de facto the Celtic Bloc from the equation of who will form the government in the event of a hung parliament. That has got to be the Conservatives' advantage surely?