Nicholas Soames, the grandson of Britain’s World War Two leader Winston Churchill, will be expelled from the Conservative Party after voting against Prime Minister Boris Johnson on Brexit. From Keberoxu's link above.

What does this mean? Does he have to choose another party? Or are they somehow 'unelecting' him - is he out of parliament completely? If Johnson needs a majority, why is he discarding members?

Inquiring American minds want to know.