Hutton
...but you'll note that he restricted his answer on the politics show. He said that the carriers would be equiped with 'capable aircraft' - and didn't specifically name JSF. There was also a lot of 'eyes left' when he was given those questions. A body language person might suggest that he was hitting a grey area at that point.
.. and the horrendous maths that some might be doing:
tranche 3 - circa £9bn
JSF - £9 - 12bn
Total £20bn
Marinised tranche 3 circa £14bn = £6bn saved.