Ex-Rigger, as of last week, the customer has not asked for FDA, OBIGGS, Bomb Bay FP, Probe inerting and under-floor FP on MRA4. Of that I can guarantee you. Design for AAR pipework, essentially the same in MRA4.
We await the recs from BoI.
In the case of XV179, UORs hit the desk the day after the BoI was published.
Fingers crossed for the Nimrod fleet.