We don't have a specific explanation for this. We used National Defence data. We know that the net weight of the ship has increased, so there are probably changes in the specifications. We also know that the type 26 isn't used anywhere on the planet. So it's a new type of ship, which could explain some of the delays.
In any event, we didn't conduct a thorough investigation to determine the exact nature of the delays. The perspective of our report is forward-looking, so not backward-looking. We want to determine ship costs rather than the causes of past events.