Thanks - another considered post, and I respect your views. Personally, I'd disagree with a couple of things though.
First, I am not sure we had "economic stability" under New Labour. They inherited an economy that was in great shape and took over at a time of high GDP growth across the globe and a generally favourable economic environment. And they were not so left wing (obviously) as the likes of say, Michael Foot, who would have just gone around nationalising everything and bankrupting the country in perhaps 1 term or less. But nevertheless, the spending-spree Blair and Brown went on - however justified or not - was unaffordable. To fund his "habit", Brown raided just about every tax pot he could think of, and invented more when the easy-pickings were exhausted. Usually hidden (tax on pension funds) or cleverly disguised as not being tax at all, but just necessary for environmental friendliness (airline taxes, huge road tax increases). Brown loved his "no more return to boom and bust" line, but it was a sham, supported only by him being chancellor during a period of worldwide growth and prosperity. Despite all his tax hikes, Brown had managed to run up a 3% budget deficit (from what was previously a surplus), even before the crash of 2008. Clearly the crash made things a whole load worse, but in some ways it's an easy excuse. The reality is the wheels were already falling off. It's just that had taken 10+ years to break things rather than the usual five.
Second, Cameron didn't pick up where Brown left off at all. He decided that we must do something to reduce the deficit, and ideally to eliminate it and get back into debt repayment. This didn't even feature in Labour's rhetoric. I hardly remember either Blair or Brown talk about the national debt at all, during the three terms in power.
And I think this is where the ideological divide between conservatism and labour lies. I don't know anyone on either side who believes that inequality and social injustice are good things to which we should aspire. But unfortunately I have yet to see evidence of a society that prioritises taking money off rich people, in order to give it to poor people, thrive in the long term. Ultimately it damages the economy, to the benefit of no-one. So it's about a balance, and trying to balance the rich-poor divide by penalising people for being successful is not the answer.