Simple then! Tuc for Head of DE&S
I know you mean well but I wouldn't last 5 minutes.
The first thing I'd do is enforce the legal obligation to ensure "requirements" that do not pass Requirement Scrutiny are not approved. At a stroke this would force most of DE&S and DEC to acquire competencies the rules say they should have, but have not been imposed for 17 years (Dec 92), when DGSM (RAF) ruled it a sackable offence to refuse to make a false declaration that a requirement passed scrutiny, when it did not. (i.e. commit fraud). A ruling subsequently upheld by PE, DPA, DLO and a raft of Ministers although, to be fair, they removed the sacking bit. (First offence - formal verbal warning and told to find another job).
As this would directly oppose Ainsworth, as well as senior MoD staffs, I'd be sacked on the spot.
But I'm sure the NAO would be interested and the tribunal entertaining.