It wouldn't have to be just LibLab though. Plaid, SNP, Green and SDLP could all be brought on board - all are broadly left. SDLP have taken Labour whip before apparently.
Lance Price made a rather convincing case on the BBC for allowing a Tory minority administration, letting them get an emergency budget through, but the left parties all working together in opposition to protect frontline services and work for PR. Worse things could happen, god knows
Agree these threads have been great but not sure whether it's a great thing, really, that MN has broken along left/right lines so decisively - the whole pre-election period has been extremely bad-tempered hasn't it?