Well yes and no, BAE said they could have easily converted it from VSTOL to CATOBAR configuration at minimal cost - what they meant was they guessed they could without doing their sums first. The new RN carriers were intended to be fitted with EMALS (Electro-Magnetic Aircraft Launch System) instead of the steam catapults used on most modern carriers. Unfortunately, they have had some issues with this and there were also doubts the RN Queen Elizabeth class actually would have sufficient electrical power to run the system...and converting them to steam catapults would mean adding "Donkey" boilers to the design, which would have required considerable redesign and alterations to it. Also BAE wanted a lot of cash to do the work!
By at 'the proper time' I meant from the beginning or near as, not the hasty and ill thought out back and forth wavering that happened mid way though the program. Designing from the ground up as CATOBAR carriers would have produced a much more effective unit with far more options for airwing complement.
The bottom line is that due to design compromises VTOL aircraft can never match the performance of conventional types, and basing the centrepeice of your naval aviation arm around that concept when you easily had the money to do it the right way from the beginning, seem like foolishness at best, criminal incompetence at worst.
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