I'm surprised that P&O haven't followed Princess, and "fenced" off part of one MDR for suite and club class mini suite cruisers. Open for breakfast, lunch (sea days) and dinner, with a seperate entrance, no reservations required, the same wait staff, and an additional main course for dinner, over and above the standard MDR menu.
The club class supplement ( now termed Reserve Class ) for the minisuites would more than offset any extra costs