I think New Labour have done an awful lot to get us in this mess. Prudence? Never happened.
I'm just the local thick kid from the local comprehensive. But even I know the basics of fiscal management - when the times are good, pay off debts, and maybe even try to save 'for a rainy day'. When the 'rainy day' comes, it gives you extra flexibility.
New Labour; we'll borrow even more in the good times, in the vain hope of paying it back in the even better times, because "this is the end of boom and bust economy".
Additionally, by discouraging manufacturing in the UK, in preference to a finacial services economy, New Labour left us severely exposed when that market sector hit problems.
But that aside, any ruling party becomes stale, ineffective and out of ideas by the end of the 2nd term. Then they come out with stupid ideas about giving our pets lots of mental stimulation or face a £20k fine.
Nope, Labour must go.
Essentially correct, IMHO.

It is unarguable that the basic rules which govern personal finance apply equally to the economy of the state, i.e. if your outgoings exceed your income, you must reduce your outgoings and/or increase your income.
Given that the above is a fact of life, it follows that public spending must be cut. Much of this can be done painlessly, but given that there is a socially-acceptable limit to such cuts, attention must be paid to increasing income. In the case of the state, this means increasing tax income and it is here that ALL the main parties (and several economists) get it wrong. If personal tax/vat/duty, etc. is increased significantly, the effect will be to cause stagnation within the economy. Companies will see reduced demand and increased costs. Many will only be able to survive with wholesale cost-cutting - which normally means redundancies. Many will inevitably go to the wall - more redundancies.
Where employed people pay tax and spend a proportion of their net income (thus generating more income for the government). In contrast, those who are unemployed are a drain on the public purse - not only are they not paying tax, but they are obviously costing the government in terms of social security payments - so the government debt gets worse and the cycle continues.
What an incoming government should do (but won't) is to cut public spending
AND taxation. That would provide a stimulus to the economy and thereby increase the overall tax income. The additional benefit of a stimulus to the economy would be an increase in new business start-ups, rather than closures, providing the prospect even better rates of fiscal income in the future.

But what do politicians know? Generally, the square root of bu**er all.