After May's defeat on her Brexit deal, Labour tabled a motion of no confidence. The government can lose the vote if either DUP and/or ERG/Brexiteers (these being from the Conservative Party) vote against the government. The latter would imply MPs from the government voting against itself.
Is there a precedent in the UK Parliament of this? Have MPs ever voted against itself in a motion of no confidence?
There seems to exist precedents in other countries (where the vote is called by own MPs).