An analysis of email leads delivered by Zoopla and Rightmove throughout 2014 shows much less duplication between the two than previously thought, Connells has claimed.

Internal data from Connells shows that of all consumers who sent email leads through the major portals, 93.8% were unique to either Zoopla or Rightmove with only the remainder duplicated between the top two portals.

Furthermore, said Connells, for the highest value market appraisal leads, 99.9% were unique, with just 0.1% duplication.

David Plumtree, Group CEO of estate agency at Connells, said: “With the recent launch of Agents Mutual, we were keen to confirm the value delivered to our network by the major property portals, reaffirming the low level of duplication of leads between the two main players, which has continued into 2015.

“The value of being on both Zoopla and Rightmove is clear, and remains the best choice for our customers and network of agency offices in 2015.”

Connells is a shareholder in Zoopla. Like the other corporates, it has not signed up to OnTheMarket.