I saw a Princess cruise this coming December from Sydney and any solos can’t book an inside cabin , you can book for 2 and maybe the 2nd person can be a no show and get your fees and taxes but no use ringing p&o or Princess because it gets you no where, they want to fill up the ship with 2 or more people per cabin
just had a look at the cruise again and solos can’t get an oceanview or a balcony but if they wish to pay $4000 for an 11 night cruise to the South Pacific they can get a mini suite