The spending estimate behind a larger British force

How much defence spending would be needed to achieve the proposed rebuilding?

The estimate is about four percent of GDP for the original review's ambitions; with less money, the proposed priorities are technology and personnel.

Meeting the original strategic review's Army, Navy, and Air Force ambitions is estimated to require about four percent of GDP, compared with the three percent commitment mentioned in the discussion. That level is considered unlikely, so priorities would have to be chosen. The proposed emphasis is on technology and personnel. Special forces are rejected as a general substitute for broader military capacity because their numbers are limited and they cannot perform every assigned role.