There will be no valuation tools on the new OnTheMarket site, no information as to when a property was first marketed, and no history of price reductions displayed.

Ian Springett said that all these features are unhelpful to agents trying to market a home to best effect for their client.

Springett also said estate agents should be entirely in charge of how they market properties – and not portals.

He also said portals should not aim to mimic or cut across what estate agents do.

Ian Springett, chief executive of Agents’Mutual which launches OnTheMarket on January 26, was speaking after one of this week’s hot issues.

The Telegraph last Sunday ran claims – repudiated by Springett – that OnTheMarket wants agents to hold back properties from whichever other portal they are on.

It reared its head again yesterday, when the Daily Mail followed up on the story in its City pages here

Springett  emphasised to Eye that agents – and not portals – are fully entitled to make their own decisions on marketing and how best they serve their clients.

He said: “It seems to me this goes to the nub.

“When a vendor instructs an agent, they are appointing them to market the property and achieve a satisfactory sale of it.

“Only then does the agent get paid. So the vendor is paying the agent for what will be a completed sale.

“The agent then selects the marketing which should be done – generally at no extra cost to the vendor – and wants to place the advertising in the most effective environment. It is their call when each piece of advertising runs.”

He said this was one of the key areas of distinction between a full-service agent and an online operator.

He said: “If the vendor goes to a fixed-fee internet-only provider, then they are effectively just paying for a listing on selected portals and they pay up-front.

“Obviously they want the portal listings specified which are the main thing they are getting for their money.

“The Rightmove analysis of internet-only market share recently put it at 2%. And this after 20 years of the internet.

“The great majority of property-owners recognise the benefits of engaging a local, visible, full-service agent who will work for and with them to manage the transaction end-to-end.”

Springett also emphasised the legality of the ‘one other portal’ rule.

He said: “We consulted our lawyers. There is nothing anti-competitive about it.”

Springett listed the features the new portal will not have as including:

– “Our own statistics-based opinion of the value of their client’s property”

– The date on which a property was first marketed

– The price reduction history

– Trends in page views of the property

– “Intrusive advertising for other things”

– “Links to adverts for other agents”.

Springett said: “These are all things that are fundamentally unhelpful to the person trying to sell or let a property.”