MPs will vote on whether to make a seismic change to the law on assisted dying today as campaigners seek to allow medics to help people to die.

The biggest change on the law on suicide for decades is expected to take place this afternoon, with the result on a knife edge.

Kim Leadbeater is confident her plan to allow terminally ill people with six months or less to live to be helped to end their lives will pass the Commons.

But opponents of the Terminally Ill Adults (End of Life) Bill also believe they may have the numbers to see it off the proposed decriminalisation in England and Wales.

The legislation passed a preliminary vote last November by 55 votes. But since then more than 20 MPs who backed it have publicly changed their minds, and the Bill would fall if 28 MPs switched directly from voting yes to no on Friday.