No, agreed. It can offer change, but as you say, it runs the risk of being dragged through the Courts by stroppy Chief Techs if it compels it.
The scheme gets fettled with, more often than you might think..
http://195.99.1.70/si/si2009/em/uksiem_20090544_en.pdf
.. so padding in a notice period won't make much difference; if anything, it should have a positive impact on recruiting as people rush to get in with the old scheme. If/when the Tories get in, the time to do anything will be sooner rather than later I guess.
And a Happy New Year to you as well.