The start-up will be based near London's Chancery Lane, rather than in the Aldwych home of the7stars, and will share an office with Blackwood Seven, the new Danish media agency that uses artificial intelligence and is preparing to open in the UK.
The7stars is named after a London pub called Seven Stars in Holborn, where the independent agency’s co-founders plotted its launch in 2005, and Bountiful Cow is the name of its sister pub, also in Holborn. The7stars has no connection with the two pubs.
Jenny Biggam, a co-founder of the7stars, said the agency wanted to launch Bountiful Cow because it did not want the7stars itself to get too big.
Both agencies are expected to become part of a mini-holding company.
Biggam said: "The intentions are to create an organisation that directly challenges the current status quo of the media industry, including the lack of transparency and trust between agencies, clients and in many cases their own talent."
Daglish is due to join in November after he has completed a period of gardening leave and is expected to hire a management team.
The7stars won Agency of the Year at the 2015 Media Week Awards and in the 2015 Campaign Annual.
The agency celebrated its 11th birthday with a party at Ministry of Sound last night.
