Labour’s controversial new shadow chancellor John McDonnell has laid into the private rented sector.

During his Labour party conference speech yesterday, McDonnell referred to cutting the “billion pound tax breaks given to buy-to-let landlords” and called for action to control “exorbitant” rents.

However, new data shows that rents have barely gone back up to 2008 levels across much of the UK.

The new data, from franchise chain Belvoir, shows how badly hit landlords’ rental incomes were during the recession – and how little they have recovered since.

Indeed, in 12 counties where Belvoir offices have been in business since the onset of the credit crunch, rents are still below 2008 levels.

Analysis of the Belvoir offices that have traded over the last seven years, shows that average rents in the second quarter of this year exceeded a peak in the third quarter of 2008 by just £6 per month.

Furthermore, the 2008 peak was not achieved again until the last quarter of last year.

The lowest rents over the last seven years were recorded in the third quarter of 2009, at an average of £670 per month.

In the first quarter of this year they hit £710, and in the second quarter £708.

For all Belvoir offices, including new ones, the average monthly rent recorded for the second quarter of this year was £756.

In London, rents are much higher than in 2008 – and indeed London tells a different story entirely.

Average monthly rents in 2008 were just under £1,200. While they fell back a little the following year, by the final quarter of 2009 they were exceeding 2008 levels.

London rents continued to rise unevenly until soaring to a significant new peak of about £1,700 per month in the first quarter of 2012.

Rents have since fallen back and in the second quarter of this year were £1,460.

Belvoir’s director of commercial and franchising, Dorian Gonsalves, said: “The Belvoir quarterly rental index, which is prepared by property analyst Kate Faulkner, has picked up rises in rents in most places across the country since Q4 2014, but contrary to media reports these are far from extortionate or spiralling out of control.

“Belvoir’s data shows that in 12 counties where Belvoir has been trading for the last seven years, Q2 2015 average rents have still to recover to the highs of 2008. These include Cheshire, Dorset and Northamptonshire.

“In contrast, inflation has risen by 19.17%.

“The number of Belvoir counties that exceeded the 2008 rental highs during Q2 2015 was 19, and these include Bedfordshire, Worcestershire and Wiltshire.

“Unsurprisingly, the highest increase over this time was in London where rents have increased by 22% since 2008, in line with inflation.

“However, in the East Midlands, rents are still 2.5% lower than they were in 2008.”