I went and found it, but only coz I like you
danny's post from the indy thread in the Scotland/Alba forum.
That's not true, though, as has been pointed out several times during the thread. The thing to remember is that Scotland only returns a tiny proportion of the UK's MPs; in 2015, the number of Scottish MPs will be 52 out of 600. That's 8.66%. And although Scotland only returned one Tory last time, not all of its other MPs are Labour: there are also SNP and Lib Dems. Indeed, those Lib Dems actually contributed to putting David Cameron into number 10 last time.
When Blair came to power in 1997, his majority was 179. Without Scottish MPs he'd still have had his majority (even if all of Scotland’s MPs were Labour, which they weren't).
Here are the stats again:
http://wingsland.podgamer.com/why-labour-doesnt-need-scotland/