OnTheMarket boss Ian Springett has countered claims made in yesterday’s trading statement by Zoopla that OTM would be a “short-term” event.

Springett said that the phrase demonstrated “just how out of touch Zoopla is with the commitment of our member agents to create a superior market-leading, mutually run property portal”.

The new figures he quoted also reveal a rise of 100 agency offices subscribing to OTM since its launch at the end of January – now 4,700 branches, up from 4,600.

Springett said: “Zoopla reports an 11% reduction in the number of estate agent branches listing their properties from this time last year.

“However, we believe a more relevant period is from September to date which was when most of our member agents had to choose which portal to retain and which one to drop.”

Yesterday, analyst William Packer from Exane BNP Paribas suggested Zoopla’s estate agency figures had fallen “a significant 21%” since September, including 500 branches which have submitted notice but are not yet removed from Zoopla Property Group.

Springett said this represents a “genuine sea-change” in the property portals market.

Springett said: “It was and continues to be the choice of our member agents to decide from which portal to remove their listings.

“Of our 4,700 contracted offices, around 90% have chosen to reject Zoopla.

“In Zoopla’s annual report dated September 30, 2014, their claimed property listings were 1.1m, which they defined as ‘the total number of properties being advertised for sale or to rent at the end of this period’.

“According to the number of properties for sale and rent on Zoopla’s website today, the figure is 810,256 – a reduction of 26%.

“This is clearly a reflection of the number of agents who have removed their listings from Zoopla.

“However, many of our member agents are questioning whether Zoopla Property Group really has the claimed 810,256 UK properties ‘being advertised for sale or to let’ – i.e. available to buy or to rent – and believe that the true figure for available properties in England, Scotland and Wales, as searchable on the Zoopla website, has fallen to below 460,000.”

A spokesperson for Zoopla responded, telling Eye: “As a public company on the London Stock Exchange many of our metrics including traffic, leads, branches and listings are in the public domain.

“We are a data driven business and focus on ensuring that we deliver the best value for our members which was again confirmed this morning with our record traffic and record leads per listing and member.

“We will continue to let the data and facts speak for themselves over the coming weeks rather than engaging in speculation and escalating the rhetoric.”

* OnTheMarket advertising was shown in a break – as was Rightmove’s Find Your Happy – during last night’s C4 ‘Location, Location, Location’ co-presented by Zoopla ambassador Phil Spencer.

Spencer fronts a new video telling people to make sure their properties are widely advertised on the Zoopla sites and Rightmove.

In case you haven’t seen it, it is here

OTM also has a particuularly strong presence in this week’s edition of Country Life magazine. Out of 22 pages of property advertising, almost all carry the OTM branding.

Only eight do not – including Chewton Rose, which as part of Spicerhaart could do so.

The magazine also has a full-page display advertisement for OTM.