On the most recent disputes, Prof Kemp sides with the Scottish government in challenging the outlook of the Office of Budget Responsibility as being unduly pessimistic.
It also says there should be a Fiscal Commission to advise future Holyrood governments on the public finances - a role now carried out for the UK by the Office of Budget Responsibility.
The Office of Budget Responsibility's gloomy forecasts of lacklustre economic growth, living standards squeezed more than at any time since the 1930s and rising government debt could - it admits - turn out to be optimistic.
Mr Osborne will undoubtedly ramp up the pro-growth rhetoric when Parliament reconvenes in the autumn, not least because he is likely to have to announce the fourth downgrading of the Office of Budget Responsibility's 2011 growth forecast (currently 1.7%).
Lord Barnett accused the minister of giving him a "long wordy answer" and said that, while Prime Minister David Cameron had promised the deficit would be eliminated by 2015, the Office of Budget Responsibility said this would only be achieved by 2017 .
Other spending heads will face the same squeeze as all those public sector workers if their cash allocation flat-lines - 4 to 5% this year, maybe down below 3% next year, but still requiring a deeper real terms cut than officially recognised by the 2.9% inflation rate currently assumed by the Office of Budget Responsibility.
The Bank of England and the Office for Budget Responsibility think the slow pace of growth since 2010 owes more to the eurozone and imported inflation than it does to Mr Osborne's tax rises and cuts in public investment.
He has already pulled off some notable coups, including getting the Chancellor George Osborne to agree that his committee must approve the hiring of the head of the new Office for Budget Responsibility - the body which has the job of keeping the Government's economic numbers honest.
The MPs also questioned the track record of the Office for Budget Responsibility, set up in 2010 to provide independent forecasts for the economy and public finances.
Mr Bercow paid tribute to Chancellor George Osborne for his "bold" decision to ensure that the Treasury committee would have a veto on the appointment of the Office for Budget Responsibility chief Robert Chote.
BBC: Commons Speaker calls for sweeping new committee powers
Early in the life of this parliament the Treasury Select Committee won the right of veto over the chair of the Office For Budget Responsibility, the body which was set up to vet the Treasury's economic projections and budget figures.
So although another of the Office for Budget Responsibility's forecasting booboos was to anticipate faster growth in consumer spending than has materialised, ministers were well aware that they could not count on the behaviour of consumers to lead the UK back to prosperity.
As far as economists are concerned, the important point from the Budget was that borrowing was going to be broadly flat for three years - leading the director of the Office for Budget Responsibility (OBR) to suggest that the progress cutting the deficit had "stalled".
Now, you have the chairman of the Office for Budget Responsibility giving him what can only be described as a ticking-off, for suggesting that the OBR didn't think spending cuts and tax rises had had any effect on the pace of the recovery - "quite the opposite".
Both the Bank of England and the Office for Budget Responsibility, which prepares economic forecasts for the government, have warned that GDP may have contracted in the fourth quarter of 2012.
The talks are part of the IMF's annual review of the UK economy, and will involve meetings with the Treasury, the Bank of England, the Office for Budget Responsibility, and independent economists.
Call me crazy, but I can't help thinking this very public show of independence by the Office for Budget Responsibility, 10 days before the Budget, could end up being more helpful for the government than it seems today.
Of all the bad news unveiled today by the chancellor this might well be the worst: after two and a half years of austerity, the Office for Budget Responsibility (OBR) is likely to say that the fiscal hole that Mr Osborne promised to eliminate in five years, back in May 2010, is actually bigger now than it was then.
In spite of this, the economy has remained weak, with the the Office for Budget Responsibility now halving its previous 2013 growth forecast of 1.2%.
But official forecasts by the Office for Budget Responsibility for any kind of meaningful economic recovery in the UK are predicated on that household indebtedness rising back to around 180% of disposable in the coming few years.
The central projection in the latest graph shows that the Bank predicts growth somewhere between 2.5% and 3% next year, below its previous forecast, but above the Office for Budget Responsibility's current estimate of 2.3%.
The Chancellor will deliver his statement to Parliament against a very gloomy backdrop of economic figures from the independent Office for Budget Responsibility and from the OECD which says the economy is about to slip back into recession.
All these relatively minor measures are likely to be overshadowed by yet another downgrading of the official economic forecasts by the Office for Budget Responsibility which is likely to predict lower growth and higher borrowing in the years to come.
For economists, the key change is to the Office for Budget Responsibility's (OBR) assessment of the economy, which I mentioned earlier.
But earlier, the same committee had been told by a Budget expert - Steve Nickell of the Office for Budgetary Responsibility (OBR) - that the chancellor's scheme would push up house prices and generate only a "bit" more house-building.
The FT somewhat cheekily points out that the Office for Budget Responsibility did see fit to incorporate the impact of the bank payouts on household incomes, in its revised economic forecast at the time of the Budget.
In May the government set up the Office for Budget Responsibility, to provide the government with independent forecasts of UK economic growth and public deficits.
Sir Alan was also the first chairman of the government's independent forecasting body, the Office for Budget Responsibility (OBR), but left after just three months in the job.
BBC: Sir Alan Budd and Hector Sants on New Year Honours list
Even more worrying, in the short term, is that alarming statistic I flagged up last week: the Office for Budget Responsibility expects us to run a current account deficit of 4% of GDP in 2012.
The loosening has come because Mr Osborne has allowed borrowing to go over target as the economy has disappointed - even though the Office for Budget Responsibility told him last November that a good chunk of that extra borrowing might not go away when growth returns.
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