The Chancellor has already announced some £15.6bn of spending on public transport in England’s city regions, and £16.7bn for nuclear power projects, the bulk of which will fund the new Sizewell C plant in Suffolk.
But the spending review is expected to set out tough spending limits for departments other than health, defence and education.
Although Reeves is reported to have agreed to an above-inflation increase in the policing budget, this is thought to have come at the expense of cuts in other parts of Home Office spending.
And sources close to London Mayor Sadiq Khan have expressed concern that the spending review will have nothing for the capital.
Ahead of the spending review, the Institute for Fiscal Studies has warned that any increase in NHS funding above 2.5% is likely to mean real-terms cuts for other departments or further tax rises to come in the budget this autumn.
The chancellor has already insisted that her fiscal rules remain in place, along with Labour’s manifesto commitment not to increase income tax, national insurance or VAT.
She will say on Wednesday: “I have made my choices. In place of chaos, I choose stability. In place of decline, I choose investment. In place of retreat, I choose national renewal.
“These are my choices. These are this government’s choices. These are the British people’s choices.”