Further moves to amend the controversial assisted dying bill are being made by MPs as it returns to the Commons for another day of emotionally charged debate.

After a marathon committee stage, when more than 500 amendments were debated, of which a third were agreed, the bill returns to the Commons with 130 amendments tabled.

As a result, the final and decisive votes on whether the bill clears the Commons and heads to the House of Lords are not expected until a further debate on 13 June.

The bill proposes allowing terminally ill adults with less than six months to live to receive medical assistance to die, with approval from two doctors and an expert panel.

Why is assisted dying so controversial – and where is it already legal?

In a historic vote last November, after impassioned arguments on both sides, MPs voted 330 to 275 in favour of Labour MP Kim Leadbeater’s Terminally Ill Adults (End of Life) Bill.

Sir Keir Starmer voted in favour, while Deputy PM Angela Rayner, Foreign Secretary David Lammy, Health Secretary Wes Streeting and Justice Secretary Shabana Mahmood voted against.

The Conservatives were also split, with leader Kemi Badenoch voting in favour and former PM Rishi Sunak against. Reform UK leader Nigel Farage also voted against the bill.

The PM, who is attending a summit in Albania, will be absent this time, but asked for his current opinion, told reporters: “My views have been consistent throughout.”

No fewer than 44 of the new amendments have been tabled by Ms Leadbeater herself, with government backing, a move that has been criticised by opponents of the bill.

Opponents also claim some wavering MPs are preparing to switch from voting in favour or abstaining to voting against and it only needs 28 supporters to change their mind to kill the bill.

Confirmed switchers from voting in favour to against include Tory MPs George Freeman and Andrew Snowden, Reform UK chief whip Lee Anderson and ex-Reform MP Rupert Lowe.

Labour MP Debbie Abrahams and Tory MP Charlie Dewhirst, who abstained previously, are now against and Labour’s Karl Turner, who voted in favour at second reading, is now abstaining.

Mr Turner, a former barrister, told Sky News that an amendment to replace a high court judge with a panel of experts “weakens the bill” by removing judicial safeguards.

But in a boost for the bill’s supporters, Reform UK’s Runcorn and Helsby by-election winner Sarah Pochin, a former magistrate, announced she would vote in favour. Her predecessor, Labour’s Mike Amesbury, voted against.

“There are enough checks and balances in place within the legislation – with a panel of experts assessing each application to have an assisted death, made up of a senior lawyer, psychiatrist, and social worker,” said Ms Pochin, who is now the only Reform UK MP supporting the bill.

A Labour MP, Jack Abbott, who voted against in November, told Sky News he was now “more than likely” to vote for the bill, which was now in a much stronger position, he said.

Ms Leadbeater’s supporters strongly deny that the bill is at risk of collapse and are accusing its opponents of “unsubstantiated claims” and of “scare stories” that misrepresent what the bill proposes.

“There is a pretty transparent attempt by opponents of the bill to try to convince MPs that there’s a big shift away from support when that simply isn’t true,” an ally of Ms Leadbeater told Sky News.

Speaking in an LBC radio phone-in on the eve of the debate on the amendments, Ms Leadbeater said she understood her bill was “an emotive issue” and there was “a lot of passion about this subject”.

But she said: “I would be prepared to be involved in a compassionate end to someone’s life if that was of their choosing. And it’s always about choice. I have friends and family who are very clear that they would want this option for themselves.

“There is overwhelming public support for a change in the law and literally everywhere I go people will stop me and say thank you for putting this forward. I would want this choice.”

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Also ahead of the debate, health minister Stephen Kinnock and justice minister Sarah Sackman wrote to all MPs defending the government’s involvement in Ms Leadbeater’s amendments to her bill.

“The government remains neutral on the passage of the bill and on the principle of assisted dying, which we have always been clear is a decision for parliament,” they wrote.

“Government has a responsibility to ensure any legislation that passes through parliament is workable, effective and enforceable.

“As such, we have provided technical, drafting support to enable the sponsor to table amendments throughout the bill’s passage. We have advised the sponsor on amendments which we deem essential or highly likely to contribute to the workability of the bill.”