Peers are debating former Labour Lord Chancellor Lord Falconer's assisted dying bill.
The Bill proposes allowing doctors to give a lethal dose to terminally ill patients judged to have less than six months to live.
A survey conducted for ITV's Tonight programme found 70% would support allowing assisted dying under the framework outlined by the Assisted Dying Bill.
The former Archbishop of Canterbury Lord Carey has broken free with the Church of England's stance on assisted dying and said it would not be 'anti-Christian' to legalise it.
Writing in the Daily Mail, he said he would be backing legislation tabled by Lord Falconer which proposes allowing doctors to prescribe a lethal dose to terminally ill patients with less than six months to live.
He warned that by opposing reform the Church risked 'promoting anguish and pain.'
It marks an extraordinary U-turn by the 78-year-old cleric, who was Archbishop of Canterbury from 1991 to 2002.
Ahead of tomorrow's Lords debate on assisted peers, Tonight speaks to those arguing passionately for and against the Bill.
Chris Woodhead, the ex-Ofsted chief who suffers from motor neurone disease, has made an emotional call for assisted dying to be legalised.
Lord Falconer insists his Bill will provide clarity to fix Britain's "broken" laws around assisted death whilst protecting the vulnerable.