House prices are 28% too high and mortgage debt is “unsustainable”, a new report has claimed.

It says that total household debt is massively up, and that the recovery is “extremely fragile”.

The report, Consumer Credit Trends by independent research company Verum Financial Research, says the UK economy is risking a major downturn due to unsustainable levels of household debt.

The report says that for every 0.5% increase in the Bank of England base rate, there would be a £48bn reduction in household spending.

If the base rate increased to 3% it would tip the UK economy back into recession – and house prices would undergo a “sharp correction”.

Professor James Fitchett, of Leicester University School of Management, says in a foreword to the report: “The prospect of even slightly higher marginal lending rates could have a catastrophic effect on the economy.”

The Verum report says that household debt remains unsustainably high due to spiralling mortgage debt. Last year, it says, of £1,437bn  total household debt, 89% was mortgage debt.

Robert Macnab, Verum’s director of research, said: “This elevated level of mortgage debt is unsustainable.

“In a stable housing market, house prices should grow at the same rate as household incomes so that periodic ‘booms and busts’ are avoided.

“So unless wages increase quickly, which is unlikely, our analysis of the relationship between household incomes, debt and property prices indicates that UK house prices are currently over-valued by 28%.

“The average should be nearer to £180,000 and not £250,000 as it is at present.”

Ironically, the Government’s  two “official house price indices” suggest that prices somehow manage to be both not far adrift of £180,000 (Land Registry) and also £250,000 (ONS).

The ONS is currently quoting £264,000 UK-wide, and the Land Registry’s latest monthly report is quoting £169,124 for England and Wales.

It begs the question: had these researchers chosen the Land Registry figures, would they have argued that house prices are actually too low?