Dare I suggest RAF E3D.
On time, on budget, and the end user got exactly what they needed/wanted. And is wasn't tarnished with the need to accomplish many and varied different mission profiles I.e. Not a multi-role frame.
'Course, the fact that it was predominantly an RAF managed project, and more than one Senior Officer involved came from an AEW background probably made a large contribution.
Add to this, it wasn't hijacked by political vote-chasing decisions.
The less ingenious might suggest its total programme success lay in the fact BAe weren't involved, but that might just be seen as sour grapes.
Camlobe.