The problem now being short of a majority, it's having to cobble together a coalition. We 'know' that the Conservatives and the Lib Dems have had continuing talks about what's on the agenda for 2015-2020 should they need to team up again, so much so that it's quite possible to rule out a Lib Dem coalition with anyone else. It's just there's no one else left. Labour, and I'm being half serous, half not here, would much rather go into a coalition with the DUP than the SNP; they detest each other. A deal with the SNP allows what's left of Labour in Scotland to wither and die and also sow seeds of resentment in England. Which suits the SNP. The secret is, and it should hopefully be obvious now, is that independence for Scotland will not happen by another referendum but by mutual consent at a parliamentary level; Scotland may have to allowed to drift off in order to restore some resemblance of normality in the rest of the UK if things continue as they are now.
Shades of the IPP.