City analysts are downplaying any threat to Rightmove by OnTheMarket, the portal to be launched in January by Agents’ Mutual.

Catriona O’Grady, of UBS, said: “We believe the concerns are overdone and do not expect the service to have a significant impact on Rightmove.”

Meanwhile, Jefferies International reiterated its ‘hold’ advice on Rightmove shares, although it did cut its target from 2260p to 2177p – lower than the 2275 which Rightmove achieved last week after issuing very strong interim figures.

The analyst also said that shares in Zoopla are currently under-valued and should be a “buy”.

It put its target price at 325p per share, compared with the current 250p – suggesting that those agents that did buy discounted shares are looking at making a decent profit.