Estate agents and property investors are among the UK firms in most financial distress, the latest Red Flag Alert report has said.

Insolvency firm Begbies Traynor, which produces the report, said that the total number of business in significant financial distress has risen 40% since the EU referendum.

The worst hit in terms of rises in cases of significant financial distress is the property sector.

Of the total figure of 489,000 UK businesses in distress, the property, retail and travel sectors are the most severely affected.

However, they are not alone: out of the 22 sectors studied, Begbies Traynor said that deteriorating financial performance is affecting a broad spectrum of companies, including sports and health clubs, and firms offering leisure and cultural activities.

However it is the property sector that Begbies Traylor picks out as having the highest year-on-year percentage increase across any of the sectors measured in the Red Flag Alert.

It says the property industry’s woes have worsened over the past year, with a 16% year-on-year rise – as at the end of September – in businesses in significant financial distress.

Specifically, Begbies Traynor found that property investment businesses were badly affected, experiencing a 35% rise in firms in significant financial distress.

Begbies Traunor defines property investors as firms involved in “the buying and selling of their own real estate”.

Begbies Traynor said the numbers of property investment firms in such distress numbered 13,876 at the end of September, up from 10,288 a year ago.

Its report, released to the London Stock Exchange, blames falling property prices, combined with reduced consumer confidence.

The number of residential builders in significant distress also rose, by 8% to 6,305.

The travel sector has also been badly hit, with the failure of Thomas Cook “symptomatic of broader malaise as consumers tighten their belts”.

The number of hotels in significant distress rose 7% to 5,230 as at the end of September.

Retailing misery has also spread to e-commerce, and online sellers have experienced a 10% rise in significant financial distress, with the latest figures showing 9,024 firms at risk.

A total of 31,00 retailers are now in significant financial distress, up 28% since three years ago.

Begbies Traylor said that there is also a marked increase in the number of businesses in critical financial distress, often a precursor to formal insolvency.

Ric Traynor, executive chairman of Begies Traynor, said: “This is a worrying assessment of the UK economy, with nearly 500,000 businesses now in significant financial distress – almost 150,000 more than three years ago.

“While the latest GDP figures has seen growth of 0.3%, we should not under-estimate the extent of the problems on the horizon.”

Begbies Traynor defines “significant financial distress” for businesses as having minor county court judgements of less than £5,000 filed against them; or which have been identified by the Red Flag Alert credit risk scoring system which measures working capital, liabilities, retained profits and net worth.

Critical financial distress is when firms have county court judgements of over £5,000 filed against them.

Begbies Traynor only includes economically active firms when it issues its Red Flag reports.