Just booked three nights in August. In a superior room. Not an Ambassador currently but intend to do it, either a few days before hand, or when checking in at the hotel. Will value the room upgrade and intend to buy for the breakfast/ lounge option. Only live once and I hit the big 40 that month. Will value the free night to use in the next 12 months which gives us 'an excuse' to visit another intercontinental!
Thanks for peoples advice on this thread, including those specific to my questions early on in the year.