An extraordinarily high level of non-compliance among letting agents across London has been revealed by Trading Standards.

Nearly half – 46% – of 1,922 agents inspected over a 15-month period were non-compliant with the Consumer Rights Act and/or the legislation on redress scheme membership.

In the 15 months to June, London letting agents were fined over £1.2m for breaking the law – either because they were not displaying fees, and/or did not belong to a redress scheme.

A total of 256 fines were issued, with the average being £4,695.

As well as the fines, London boroughs instigated 14 criminal prosecutions.

An enforcement survey showed 6,039 letting agents operating in London, with 1,092 complaints against them.

In the first 12 months covered by the survey there were 855 complaints, and in the final three months there were 237 – suggesting that the rate of complaints is not subsiding.

London Trading Standards operations director Stephen King said: “Dodgy agents are far too commonplace across London and private renters need to be very careful not to be ripped off.”

Since the enforcement survey, the Tenant Fees Act has been implemented, while the requirement to have Client Money Protection and hold client money in a separate account has been in force since April.

London Councils’ executive member for housing and leader of Barking and Dagenham Council, Cllr Darren Rodwell, said: “Boroughs are cracking down on rogue letting agents to protect tenants from unfair treatment.

“As the research shows, this poses a serious challenge in London, where housing pressures are so severe and a significant number of letting agents have been breaking the rules.

“Borough Trading Standards teams are crucial for tackling this issue.

“Through raising awareness, issuing fines and pursuing prosecutions, we’re determined to support tenants and make clear to rogue letting agents that bad practice is unacceptable.”

Leon Livermore, chief executive at the Chartered Trading Standards Institute, said: “The fact that London boroughs had to issue over £1.2m in fines and started 14 criminal prosecutions is truly shocking.

“This kind of enforcement work by trading standards illustrates how big a part the profession is playing in keeping UK consumers safe and holding rogue letting agents to account.”

There are 33 boroughs across London. The figures quoted exclude the London borough of Hillingdon.

Today concludes a special London Trading Standards Week, where the twin focus has been on rogue letting agents and the illegal sale of knives.

Evidence of compliance – or otherwise – is lacking on a nationwide basis, or in cities outside London.