Grills restaurants /grills lounge/grills courtyard/terrace are for the use of grill passengers only the rest of the ship is open to everybod.
Have just come back from my second trip on Q vic.. yes as MR/Ms Middelton has said those are the only areas not open to you but the rest of the ship is.. however do go up and have a look around the grills area (out side of meal times ) no one will chase you ! in fact they are more than happy to show you around .. you never know you might be tempted to try it one day ! I did, as I was ready to spoil my self.. It's the best Grills area on Cunard... Don' worry about the britannia yes there have been a few teething problems but by August it should have improved.. if you are not happy with your table do somthing right away don't wait a few days as some one will have got there before you.. I know this is not an answere to your question but I'm very loyal to Cunard however; somtimes they need a bit of a shake up..One travels Cunard for it's Britishness and I have noticed a bit of American service style creeping into the delivery of the product... If they give you a tea bag and a cup of water after dinner Demand it in a tea pot the same goes for afternoon tea in the Queens room if you like Earl grey don't accept the tea bag ask them to put it into a po.