That's nonsense. Clearly they weren't strong enough in the coalition negotiations to demand a vote on PR, they only got about the same number of seats in 2010 as in 2005.
And if they had made such a self serving, narrow subject a "clear red line" you, I have no doubt, would have accused them of pushing their own hobby horses rather than entering coalition for the national good.
Of course they wanted PR, but they were never going to get it in this coalition.
And I am thoroughly looking forward to the party of seat-preserving Tory defectors demonstrating how a party can be about "principles" and not howwible old "naked power" like what the Lib Dems are. Of course Honest Nige has no interest in power at all. Arf.