Yippee! The RN has been ripped off for too many years, and so have the rest of the services.
Being fair, as I understand it, one of the major cost rises in the CVF programme was slipping the in-service date as a short-term budget saving... seven months after signing the contract. Meanwhile the IPT have to be kept in post, the shipyard compensated, the raw materials increase in price etc. etc. resulting in more expense further down the line.
That is not just mismanagement; that is idiocy.