Generally trying to pare down the size of the state, given it's own natural processes cause it to increase, would seem necessary simply to achieve homeostasis. In the last century the long term tread has been strongly on the side of increase but it can't always be or eventually the tax burden would reach unity.
The political side of this is very transparently Scottish left wing. "... among the UK's conservatives we see an almost masochistic addiction to cuts in public spending" the phrase "masochistic addiction" is a current Labour talking point. The actual cuts amount to 2.2% of GDP by 2014-15 added to the the 4.1% Labour had already set.