Ps when we were on Britannia we were told that she was sailing with more passengers than her bigger sister Arvia. How true that is, I can not guarantee, but a number of people on there who had sailed on Arvia said they much preferred their cruise on Britannia.
Forgot to mention, we took the advice of other CC members and paid for Premium Seats on the flights. It is not cheap, but it was great and we would recommend if you can afford it. If you do want these seats though, you have to book early.
Link to our review