Haggling over Labour's spending plans is still raging with barely 48 hours until Rachel Reeves unveils the package.
Home Secretary Yvette Cooper is yet to settle with the Treasury amid bitter squabbling over police and borders funding.
The Chancellor is due to lay out departmental allocations running up to 2029 - the likely timetable for the next general election - on Wednesday.
But the generous fiscal envelope set at the Budget last Autumn has been put under massive pressure by the economic slowdown, calls for more defence cash, and Labour revolts on benefits.
Ms Reeves has been signalled she will announce real-terms increases to budgets for police as she tries to quell Home Office resistance.
