A leading agent has said that the reason why OnTheMarket is attracting so many “inaccurate claims” is because of the threat it poses to other businesses.

OnTheMarket, which bans online-only agents and through its one other portal rule resulted in a fall in Zoopla’s membership, was launched by Agents’ Mutual on January 26 last year. It had said it would overtake Zoopla by its first anniversary, but this ambition was not referenced in a statement last night by Noel Flint.

Flint, a director of Agents’ Mutual, last night expressed both frustration – and confidence in the venture. He emphasised that it was not just about controlling costs, but also data.

Flint, who is head of London residential and a partner at Knight Frank, said: “We have been impressed by the traffic figures and by the healthy mix of new and returning visitors.

“It is of course frustrating to read the numerous inaccurate claims levelled against OTM, usually from people who have a vested interested in trying to halt its rise in the marketplace.

“In truth, the fact that they go to such length is a reflection of the strength of the threat that it presents to their portal or business.”

Flint said that OTM has already created “a significant change within the portals market in a way no other recent market entrant had done”.

He said: “The reality is that the portal is working and we have every confidence that it will continue to grow.

“As more agents recognise the strategic importance of regaining control of their data and costs and as they see the strategic opportunity to serve their clients and property-seekers better with their own portal, we believe that OTM   will go from strength to strength.”

He added: “As a mutual, the venture is uniquely placed to achieve a huge step forward for traditional estate agency.

“OTM is injecting some much needed competition into what had become a rather staid arena, dominated by two giants whose main focus was the creation of enormous profit margins.”

Knight Frank was one of the board member firms which chose to retain Rightmove and removed its properties from Zoopla/PrimeLocation.

Flint maintained that OTM is providing Knight Frank’s offices with high-quality leads and their volume is steadily growing.

He said: “We chose to retain Rightmove rather than Zoopla/PrimeLocation as our ‘other portal’, a decision which was later echoed by most of the members, and which has left Zoopla and PrimeLocation with much lower property stock, not least at the high end where Knight Frank operates.

“Our clients like the portal and I don’t believe we are experiencing any loss of business since removing our properties from Zoopla and PrimeLocation to join OTM.”

Flint said that Knight Frank uses OTM to market properties 24 to 48 hours in advance of listing them elsewhere.

He said: “We feel this gives the most motivated property seekers an extra reason to search on OTM and to create a property alert to be first to see these properties.”

The board member firms of Agents’ Mutual are Chestertons, Douglas & Gordon, Glentree, Knight Frank, KFH, Savills, Strutt & Parker and Spicerhaart.