Thanks. The Princess call centre says it is OK so I will rely on that.
As an aside, I am currently receiving a series of emails from Princess regarding our dining reservation. It states that they have changed the bookings, then detail exactly what I booked for every evening - 5.40pm on the Provence. This is a 14 night cruise and so far I have received eight separate emails, each with the same details, but a different date. They have the notation 'no reply'. I doesn't really matter - I have the place and time I booked for my family group. Another email just arrived - no two more!!