I love P&O, been on Iona but there was only 2000 on it after COVID.
Cram 5500 people onto a ship and it isn’t pleasant or relaxing in any way.
Find a seat, no, find a sunbed, no ( unless you like to be on top of one another ) theatre, queues all the time, Buffet horrendous, speciality restaurants and limelight or club no chance fully booked, drinks package encourages not nice behaviour, sorry but back to the more intimate ships for me despite them being more expensive.

