I sometimes wonder how securely is a cost-cutting mentality "partitioned", so it never applies to aircraft maintenance?
Ian W's succint reply - "it is not" - is exactly right, and the evidence for that can be found in any airline where the bean-counters have taken control including, of course, BA.
A maintenance provider I was once responsible for was a subsidiary of a group that fell into hard times, and I was visited by a couple of MBA holders from a firm of "consultants" who told me to reduce the workforce "now" so as to reduce costs and increase profits. It was all so simple on their spreadsheets. This was in pre-EASA BCAR days with many categories of licence; these idiots were unable to grasp that we needed full coverage to maintain our approval and stay in business. I rather suspect that BA has been the victim of similar people, one of whom appears to be masquerading as a CEO in his hi-vis jacket and bad shave.