No doubt by "corruption" he was referring to the post Civil Service/Armed Forces employment by defence companies
As well as the Company's inflating the bill you of course get mission creep and the insistence on fitting new kit as the programme is under way - that suits the contractor, the Service and the front-line - but the taxpayer is hung out to dry
With respect to say "I hope Cummings is kept clear of any such Defence procurement review, this is for specialists, not political analysts." is about 40 years too late - the specialists are the people who have got us into this situation and without top level political direction there is absolutely no sign it will get better