I felt sorry for the Labour Councillors who were elected before JC. They had endorsed and stoutly defended the every Labour government. They had defended the Iraq war. The Sefton Labour MP's voted for the war. The councillors refused to criticise the failure to regulate the banks, the failure to increase the stock of social housing (in fact the wretched Coalition landed up with a bigger increase in the number of social housing after 5 years than Labour did after 13). Not only did they support PFI schemes they carried them out. The over-reliance on the financial services sector, the absence of an industrial strategy and the continuing decline of manufacturing all went on without a whimper of objection. The increased centralisation and London centric bias in their administration was unchallenged. The list goes on. All were defended by the Labour party in Sefton Council. I have lost count of the number of times the then Labour Leader (now MP for Bootle) supported the Iraq war.
Of course, there is precedent for Year Zero. It was declared in Cambodia in April 1975, by the Khmer Rouge, it was an analogy to the Year One of the French Revolutionary Calendar. During the French Revolution, after the abolition of the French monarchy (September 20, 1792), the National Convention instituted a new calendar and declared the beginning of the Year I and as Lady Bracknell remarked 'I presume you know what that unfortunate movement led to?' The Khmer Rouge takeover of Phnom Penh was rapidly followed by a series of drastic revolutionary de-industrialization policies resulting in a death toll that vastly exceeded that of the French Reign of Terror.
Post JC the situation is not as revolutionary as they seem to imagine. The independent and respected Institute of Fiscal Studies did an analysis of the Labour party's manifesto: