The government is unable to calculate the total cost of a secret relocation plan it set up following the Afghan data leak, the public spending watchdog has said.
The Ministry of Defence (MoD) estimates the cost of the massive data breach - and setting up a new scheme to relocate those whose lives might be at risk over it - to be £850m.
But the National Audit Office (NAO) says the MoD has not provided enough evidence to give it confidence in that figure, which does not include legal expenses, or compensation claims likely to follow.
The MoD said it was committed to transparency and "committed to honouring the moral obligation we owe to those Afghans who stood with us and risked their lives".
Last month it was revealed the details of almost 19,000 people had applied to move to the UK in order to flee the Taliban were leaked, when an official mistakenly emailed a spreadsheet that contained a hidden tab with the information in 2022.
