A complaint against an estate agent has been rejected by the advertising watchdog.

At the same time a complaint about OnTheMarket has been informally resolved, meaning that the Advertising Standards Authority will not be opening a formal investigation.

A spokesperson for the ASA told Eye: “We received complaints about a TV ad and claims on the advertiser’s website.

“The ads stated: ‘… More and more leading agents are moving all their properties from other sites to OnTheMarket.com, and are advertising them exclusively with us first, so to see properties you won’t find anywhere else…’

“The complainants challenged whether the claims ‘exclusively with us first’ and ‘properties you won’t find anywhere else’ were misleading.

“We approached the advertiser with the concerns that had been raised. The advertiser gave its assurance that they would remove the claim ‘properties you won’t find anywhere else’ from their advertising. On that basis we considered that there were no grounds for further action and closed the case informally.”

OnTheMarket chief executive Ian Springett said: “The ASA informed us two or three months ago that it had received a competitor complaint challenging a wide range of claims within our TV commercial.

“The complaint was not upheld by the ASA.

“In close consultation with the ASA, we have worked on some revisions to the detail of our voice-over in order to be more explicit about our “new and exclusive” properties and the revised version will be released in due course.”

Separately, the agent where the complaint was not upheld is Henderson Connellan of Market Harborough, Leicestershire.

It distributed promotional leaflets claiming that it had agreed the most sales, received the most instructions, had the most stock available, in various postcodes, according to Rightmove.

A competitor, Cooper Estate Agents Harborough, challenged whether the claim “most sales agreed throughout 2014 on Rightmove.co.uk in our area” was misleading.

Henderson Connellan said that Rightmove had authorised the use of the data for external marketing purposes, and its compliance team had approved the advert.

The ASA ruled that the advert gave consumers sufficient context to understand the claims, and noted that Henderson Connellan was able to supply full data to support these.