Prime minister cancels appearance at the liaison committee at the last minute.
Follows former Labour politician Chuka Umunna moving to Jo Swinson's party.
Sarah Wollaston, an independent, forced a vote on plans for parliament to go into recess in the week a new Tory leader is elected.
Ex-Tory Sarah Wollaston has been made TIG's point of contact for 'new colleagues'.
The group has no formal leader but ex-Labour frontbencher's title suggests prominent role.
PM writes to Anna Soubry, Sarah Wollaston and Heidi Allen.
The five things you need to know about politics today
The Independent Group MP also suggests Phillip Lee and Justine Greening could soon quit the Tories.
Anna Soubry, Heidi Allen and Sarah Wollaston have announced their resignation from the Conservative party. Soubry said her reason for leaving is that the the party was being run by "the right-wing, the hardline, anti-EU awkward squad". They will join seven former Labour MPs who created the Independent Group.