More importantly, MoD does not actually know where the money goes. Oh it will be aware that the budget for this programme is £Xm and that it spent £Y&Z on contracts A&B against that programme. However, (particularly when you root around in what was DLO) the actual service, thing, product purchased is very hard to touch, particularly when one adds in the RAB element.
I once saw an equipment IPT with a budget of tens of million with a line item against which was a description which no-one could actually explain what it was. That line item represented 25% of the entire budget.
Might actually be worth a root and branch review of the accounting system before butchering any more capability....