Re: Not just one cause
If so, they may actually be going the wrong way about it by continuing the 'there is nothing wrong' line.
Nimrod MRA4 was actually a good idea - in theory.
Upgrade the existing airframes, so get an improved aircraft for less cost than buying an all new type.
However, then it went a bit wrong.
The big problem was that the existing fleet of Nimrods were not identical airframes - being based on a 1950's airline, they were all subtly individual, so the sausage machine turning out and fitting new wings to each 'plane needed individual attention (adding time and cost to each conversion).
The second problem was fleet size.
I think at peak, the RAF had about 3 dozen Nimrods, and the original plan was to keep and upgraded 21 airframes (working from memory, I may be a bit out).
By the time that the decision to cancel the programme was taken, we were down to having a fleet of just 9.
So all your development costs are now hung on just 9 'planes, plus all the maintenance costs you need to keep a unique airplane type in service for a decade or more are for just 9 aeroplanes. It just was not sensible value for money.
Canceling Nimrod MRA4 was the right decision, taken at least 5 years too late.
Hopefully, Ajax isn't a repeat of that.
I suspect (and hope), though, that Ajax will turn out more like the L85: a dreadful reputation full deserved from early performance, that resulted not from fundamental design failures, but shoddy manufacture. However, once the politicians stopped lying, claiming it was perfect and world beating, and allowed for the defects to be fixed properly, it turned into a good, reliable weapon, that still gets uninformed criticism because people remember those first impression stories that get oh so many national news headlines, and not the article on page 7 explaining that everything has been fixed (see also Type 45 destroyer and the persistent reference to the design flaw that was identified and addressed long ago).
None of the above should be taken as approval of the way that the Ajax programme has been (mis-)managed.