Lucy Letby has called for the public inquiry into her crimes to be halted, arguing there is now “overwhelming and compelling” evidence undermining her baby murder convictions.

Lawyers for the former nurse took the extraordinary step of writing to Lady Justice Thirlwall on Monday to say that the inquiry – which is due to end on Wednesday – should be suspended immediately.

In a letter seen by the Guardian, they said the judge’s final report would “not only be redundant but likely unreliable” unless it was paused until the conclusion of a review of her convictions.

They added: “It is estimated that over £10m has been spent so far on the inquiry. It is now clear there is overwhelming and compelling evidence that Lucy Letby’s convictions are unsafe.

“For the inquiry to be effective and that taxpayer’s money not to be wasted, we urge that the inquiry be suspended and to wait for the outcome of the review to take place.”

Letby, 35, is serving 15 whole-life prison terms after being convicted of murdering seven babies and attempting to kill another seven at the Countess of Chester hospital in north-west England.