One LibDem Councillor quit the party so that his ward colleageu could hold a committee place that would otherwise have been impacted by a shift in the political balance of the council. Read more here. I cannot imagine for a moment how you would justify that to your local electorate, that you are massaging the political system to achieve your own ends but you have to admit it is a really brave thing to do ... as said on the blog, there is no more a noble thing to do than to lay down your political life for your ward colleague.
Meanwhile, two more LibDems have quit for better reasons - joining the Conservatives here. And this defecting LibDem delivers overall control of the council to the Conservatives here.