@ZildjianCat As mentioned, two of you would need to purchase the Plus or Premium. Forget the alcohol... are you an espresso aficionado and enjoy at least two of those a day? How about bottled water to take onshore in the hot weather? Virgin cocktails by the pool? And remember to add in the cost of gratuities and desired WiFi capabilities. Then the Plus may make sense for you.
In our experience with a Princess transfer from Southampton to LHR, it is a National Express coach and you are dropped off right at your terminal. Yes, it may cost more, but it is really convenient.
Welcome to Cruise Critic! Cruising is not without mishaps. No ship or cruise line is perfect; just like no automobile is perfect. They are all subject to mechanical errors, etc. I hope you will have a great cruise.
Yes, you can. To reserve anything in the Sanctuary, I have heard that you must RUN to the Sanctuary upon boarding to book your days. It is very popular.