"exacerbated by conducting two operations concurrently at way above scale and duration that the Defence Planning Assumptions and associated funding supported"
yes - it 's the lunatic idea you can fight a war to a pre-planned budget
In "Wolf Hall" Mantel has Thomas Cromwell tell Henry VIII in their first interview
"Wars are not affordable things. No prince ever says, "this is my budget so this is the kind of war I can have." You enter into one and it uses all the money you've got, and then it breaks you and bankrupts you."