The case here is that in previous years Azura and Britannia were based in the Caribbean. Now its Arvia and Britannia so capacity has gone up but someone in P and O missed this and when it was realised they couldn't get suitable aircraft so had to settle for Maleth. Bad planning by P and O. They should then have offered to let customers that were prebooked to cancel. Even now customers aren't being told upon booking which airline they are using. I recently went to the Caribbean and flew from Birmingham so I knew I would be flying on the Dreamliner.