A Ministry of Defence spokesman said the underspend reflected better control of equipment projects and a conscious decision not to spend money on contracts until needed.
Rather than rushing money out of the door for the sake of it within a financial year, we are committing money as and when projects require it.
We make no apologies for having a proper grip on the equipment plan and running a tight ship with a cautious approach that, with the support of the Treasury, allows us to roll forward cash to next year, thereby ensuring the money will still be spent on equipment.
More top news
Top temperature 14 Celsius (57 F).
The Prime Minister will say Moscow's brazen flouting of international law represents a threat to the basis of democracy across Europe.
In some cases, victims of violence and other serious crimes face long delays as forces are unable to dispatch officers promptly.