Representing 4,000 agents, campaign says it's time Boomin, Homesearch, Onedome, OpenBrix and PropertyHeads began marketing to the public.

Four-year-old platform OneDome has raised the cash from existing and new investors including Lord Rothschild and property magnates, the Rueben Brothers.

Some high-profile names have joined challenger portal, OneDome's sites, OneDome.com and Nethouseprices.com.

Murray Lee and Paul Davies are leading by example and have recently signed up to use the challenger portal as they urge other agents to look at Rightmove alternatives.

The five portals all claiming to offer estate agents an alternative to the Big Three are jostling for position as they sense Rightmove's weakness following the Coronavirus pandemic.

OpenBrix founder Adam Piggott says two of the big estate agency CRMs are hindering his and other portals' progress as they sign up agents and try to list their properties.

Residential People and OneDome are both offering existing and new estate agency customers services as part of their platforms.

Financial services industry marketing star Paul Troy makes surprise move to join proptech firm OneDome and plans to help 'scale it up'.