For me the definition of Conservative is low taxation, small 'g' Government (i.e, not too much state interference), and low regulation...which I suppose is similar to small 'g' Government.
So on balance, he doesn't appear to me now to be a true Tory - and I agree with ymb, in that I feel his wife is influencing him, particularly on expensive green initiatives that may not (I don't pretend to understand the science - hence my use of the word 'may') have any meaningful impact.
Where I'm torn on the tax issue is that the massive spending does have to be recouped somehow (although I think the 1.5% increase on NI next year is way way too much).