A combined ticket covers all the sights in the palaces, gardens, and museums.
You can view everything in the public galleries with one combined ticket.
Similarly, when Sir John Gielgud's obituary is written, the Shakespearean plays and films will figure prominently; less likely to be discussed are the roles in Caligula , First Knight , and Arthur 2: On the Rocks . (Luckily, Quiz participants aren't so kind.)