This is Part 3 (and final) in the series which examines the robustness of claims made by two British academics about the desirability of the British government (particularly Labour) adopting further fiscal constraints on their flexibility to advance well-being in that nation. Part 3 further develops the critique and focuses on the validity of tightening voluntary constraints on government and outsourcing key parts of the fiscal policy development process to so-called ‘independent’ fiscal councils or boards. We conclude that these suggestions would further entrench the neoliberal dominance of government policy and reduce its capacity to serve the wider interest. In effect, taking this sort of advice would be counterproductive for British Labour, which really needs to to further break out of its recent Blairite neoliberal past and present a truly progressive manifesto to the British people that will force the Tories to move closer to the centre and squeeze the extreme right-wing elements. This will require more than articulating progressive-sounding social and environmental policies. It will require more than proposals to renationalise the railways. Effectively, British Labour has to reframe the macroeconomic debate and eschew the sort of reasoning that the mainstream of my profession offers. It must, in my view, embrace Modern Monetary Theory (MMT) principles to free itself from the shackles of all the neoliberal mumbo jumbo that the New Keynesians continually offer as economic verities. The reality is the the New Keynesian approach has one output – an elaborate litany of lies.