Campaigners last night vowed to fight the assisted dying Bill in the Lords after MPs moved to legalise it in a historic vote.

In a sign of the concern about the Bill, it passed through the Commons by just 23 votes yesterday – 32 fewer than when MPs backed it in principle in November.

MPs questioned whether there was a clear mandate to introduce one of the most significant social changes in Britain for decades.

And peers vowed there would be an 'attritional' fight when the legislation, decried as a 'bad Bill' after multiple amendments were laid and safeguards stripped out, moves to the House of Lords. One warned that it may not 'see the light of day'.

The Commons voted 314 to 291 in favour of allowing terminally ill people to end their lives with the help of the State, meaning that when abstentions are included, a majority of MPs did not back the Bill.