Economists warn that increased defence spending commitments will make it "impossible" for the chancellor to invest in economic growth, public services, and net-zero policies.
The Institute for Fiscal Studies (IFS) predicts that the upcoming spending review will be dominated by funding for defence and the NHS, with other priorities receiving limited funding.
The Local Government Association (LGA) is calling for a "significant and sustained" boost to council funding to avoid devastating consequences for vital services.