The former Tory minister said she was deeply disappointed by the mass walk-out which leaves the party on the verge of total collapse. Ms Soubry is one of just five MPs to keep the faith alongside Chris Leslie, Joan Ryan, Mike Gapes and Ann Coffey. The party, originally called the Independent Group, is made up of MPs who left Labour and Tory ranks in protest at their handling of Brexit.
Change UK’s descent into turmoil began after the party performed poorly in last month’s European Parliament elections.
Ms Soubry said: “I’m deeply disappointed that at such a crucial time in British politics our former colleagues have made this decision.
“Now is not the time to walk away, but instead to roll up our sleeves and stand up for the sensible mainstream centre ground.”
Ms Allen, Mr Umunna have left the party along with Angela Smith, Gavin Shuker, Luciana Berger and Sarah Wollaston.
In a joint statement they said they had made the decision to return to an independent grouping of MPs and would continue to support each other.
The statement said: “We believe that our priority right n ow must be to provide collegiate leadership to bring people together in the national interest.
“We know the landscape will continue to shift within the political environment and have concluded that by returning to sit as independents, we will be best placed to work cross-party and respond flexibly.
“We wish our colleagues well as they continue to build Change UK.”