When it comes to Rwanda, what is Sunak counting as a ‘success’?

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Those fleeing war and persecution will likely only be more incentivised to make the journey, with a safe haven all but promised on the other side (PA )

So Rishi Sunak has at last managed to get his appalling, immoral, probably illegal – and almost certainly ineffectual – Rwanda manoeuvre through parliament.

He claims that it will “stop the boats”.

Would it be unreasonable to ask what he has decided is the criteria for success? How much of a reduction in attempted Channel crossings would he see as a victory? And how soon? If it’s less than 50 per cent – or even 75 per cent – would it be regarded as a failure?