Kim Leadbeater made a last-ditch plea to MPs to back her Bill today ahead of a crucial vote that would all but guarantee assisted suicide will be introduced to Britain.

The Labour MP said she is confident the Assisted Dying Bill has the support of enough MPs to pass tomorrow's Third Reading vote.

Assisted dying was backed by Parliament in principle during November’s historic yes vote but tomorrow MPs will debate and vote on the Terminally Ill Adults (End of Life) Bill in its entirety.

The Bill passed at Second Reading by a majority of 55 but it would fall at the next hurdle if just 28 MPs switched directly from voting yes to no while all others voted the same way today.

About 20 MPs have publicly indicated that they will vote a different way after seeing the details of the proposed assisted dying law, meaning it is likely to be tighter than in November.