Which councils will benefit from children's social care budget windfall?

The money will be available to a total of 20 councils - representing less than one in seven top-tier local authorities - which will share £85m over the next five years. That works out at an average of an extra £850,000 a year for each authority if the money is allocated equally.

But which local authorities can expect to see the money? Hammond says it will go to councils "with high or rising numbers of children in care". But precisely how this will be calculated is unclear.

Based on the most recent looked-after children statistics available, the league of councils with the highest overall numbers of children in care is topped, perhaps unsurprisingly, by Kent, with 1,900, driven partly by its status as the main entry point for unaccompanied asylum-seeking children.

It has already received additional support as part of £20m provided to councils supporting child refugees, and the number of children it looks after actually fell between 2016 and 2017 by 415 as a result of efforts to accommodate unaccompanied children in other areas. However, earlier this year the council warned that as a result of remaining responsible for child refugees once they have turned 18, their care leaver budget is underfunded to the tune of £4m.