"The party of fiscal responsibility," which, under pretty much every one of its administrations has increased national debt, whilst claiming that it is reducing it, and that "the party opposite" is the one which has done what it is doing, whilst the opposite is true?
If you don't believe me, take a look at things such as budget surplus / deficit over time - those budget surpluses are pretty much all during Labour administrations (with the exception of a couple of Thatcher years, IIRC), and graphs of national debt vs GDP, which sky-rocketed with the financial crash of 2007, but has increased steadily since despite ideologically-driven austerity.