Rishi Sunak is facing fresh pressure over his Rwanda policy after it emerged the scheme has already cost £240m, despite never being used.

The government spent a further £100m in the 2023-24 financial year while flights remained grounded amid a series of legal setbacks – on top of the £140m previously paid out.

According to a letter from the Home Office to committee chairs, ministers expect additional costs of £50m in the coming year, which would bring the total to £290m.

Politics – latest: Rwanda vote not about leadership, says Rishi Sunak

It came just hours after Mr Sunak vowed to “finish the job” of reviving his plan to deport some asylum seekers to Kigali – despite the prospect of a bitter parliamentary battle.

On the additional £100m shelled out this year, Downing Street said it was signed off by former home secretary Suella Braverman.

But those close to the sacked cabinet minister insist it was approved by the prime minister and was part of the original plan.

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Downing Street has rejected any suggestion the prime minister had misled MPs over the money for Kigali insisting that the original agreement stated the deal “involves subsequent funding”.

A spokeswoman said: “It was always set out that there would be funding attached to what is an economic and migration partnership. And this further funding was part of that.”

Home Office official Matthew Rycroft wrote to Home Affairs Committee chair Dame Diana Johnson, and Public Accounts Committee chair Dame Meg Hillier, on Thursday.

His letter said: “Ministers have agreed that I can disclose now the payments so far in the 2023-24 financial year.

“There has been one payment of £100m, paid in April this year as part of the Economic Transformation and Integration Fund mentioned above.

“The UK government has not paid any more to the government of Rwanda thus far.

“This was entirely separate to the treaty – the government of Rwanda did not ask for any payment in order for a treaty to be signed, nor was any offered.”

Will it be crisis delayed rather than averted for Rishi Sunak?

Rob Powell

Political correspondent

@robpowellnews

If there’s one thing to take from the parliamentary Brexit battles of 2019, it’s that if there’s a possibility to kick the can down the road and avoid a damaging Commons defeat, the government of the day will almost always take it.

So it may prove to be next week when the Safety of Rwanda (Asylum and Immigration) Bill faces its first vote by MPs.

Torpedoing legislation at the first possible opportunity is not a usual tactic for rebel backbenchers anyway.

That’s because later stages allow the chance for changes to be put forward and compromises extracted.

The newly appointed legal migration minister signalled on Friday the government is open to discussion.

This potentially pushes the crunch moment back to early next year.

But what could the government offer to get rebels on side?

Many Tory MPs would like the “full fat” option of disregarding the European Convention on Human Rights (ECHR) in totality.

Rishi Sunak has already made it clear that is not on the table as he says it would cause Rwanda to pull out of the deal.

Some have cast doubt on that with one Tory source hostile to the prime minister saying “questions need to be asked about the statement the Rwandans have given on our country’s laws. Was it requested by number 10?”.

Junking the whole of the ECHR would undoubtedly prompt a backlash from other parts of the party though and potentially risk cabinet resignations.

A hardening of the drafting or insertion of more “notwithstanding” clauses seems more feasible.

Another tactic sometimes used in situations like these is to draw up a separate statement or memorandum re-emphasising and cementing parts of the bill that could be referred to in the legislative text.

Whether that goes far enough for MPs remains to be seen and will depend on how dogmatic and philosophical backbenchers want to be.

One final point.

Even if this bill passes the Commons, it will certainly get a rough ride in the Lords – where the Tories have no majority.

Complicating matters further is the proximity of the next election, a tight timetable the Institute for Government says makes it impossible for the prime minister to overrule peers using the Parliament Act.

Crisis delayed rather than crisis averted then and for Mr Sunak, with 2024 looking no easier than 2023.

Labour described the revelation as “incredible” – with shadow home secretary Yvette Cooper saying: “How many more blank cheques will Rishi Sunak write before the Tories come clean about this scheme being a total farce?

“Britain simply can’t afford more of this costly chaos from the Conservatives.”

But defending the growing bill, legal migration minister Tom Pursglove told Sky News: “When you consider that we are unacceptably spending £8m a day in the asylum system at the moment, it is a key part of our strategy to bring those costs down so I think this is the right investment to make that will help us achieve those objectives of saving lives at sea, stopping people drowning in the Channel, as well as getting those costs under control in a way I think taxpayers across the country want to see.”

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Rishi Sunak facing political fight of his life

He also signalled the government could be open to compromises with rebel Tory MPs to push through emergency legislation, which declares that Rwanda is a safe destination for asylum seekers in a bid to overcome legal obstacles.

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‘My patience has worn thin, right?’

But the bill has divided backbenchers with Conservative hardliners arguing it does not go far enough and pressing for it to effectively override international law, while MPs on the moderate side of the party are said to be “very nervous” about the implications of the proposed law.

Despite the public splits, Mr Pursglove said: “I think there is a unity of purpose among Conservative MPs that action does need to be taken that we do need to deliver on this.

“There will be parliamentary debates, there will be opportunities for people to bring amendments, the house will consider them in the normal way and as ministers we will engage constructively with parliamentarians around any concerns that they have and handle that in the way that we would any other piece of legislation.

“We will engage with colleagues around concerns that they have, but I am pretty clear that this plan is the right plan and we are determined to see it through.

“This is the right approach to move this issue forward.”

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New Rwanda bill: What now?

He added: “I do think parliamentarians across the House should come together to back this.

“If you really want to stop the small boat crossings, this is such a critical part of the plan I think all MPs should be getting in behind it.”

Mr Sunak has insisted his new law would end the “merry-go-round of legal challenges”.

MPs will get their first chance to debate and vote on the Safety of Rwanda (Asylum and Immigration) Bill on Tuesday.

The prime minister dismissed suggestions he will make it a confidence vote, meaning that MPs would have the whip withdrawn if they defied him.

Under the government’s plan first unveiled in April 2022, people who arrive in the UK by irregular means – such as on small boats – could be sent on a one-way trip to Rwanda, where the Kigali government would decide on their refugee status.