That is the dematerialising control, and that, over yonder, is the horizontal hold. Up there is the scanner; those are the doors; that is a chair with a panda on it. Sheer poetry, dear boy! Now please stop bothering me.
[Reading a letter from the Doctor] "My dear fellow, I'm sure will you excuse me but I didn't want to say goodbye, as you are obviously going to be very busy for some time." He's right there. "Just in case you still idea's about your master plan, I've taken precautions to stop your time meddling." How could he stop a Mark 4? "Possibly one day in the future, when you've learnt your lesson, I shall return and release you." Release me? Ha! Me? Oh, the old fool. I wonder what he meant by release me? Well, I'll be going.
[But he can't get in. His TARDIS is the same size as the Altar. It's no longer bigger on the inside than the outside]
[Horrified] Ah! Ah! What's he done? He's taken my dimensional control! He's ruined my time machine! I'm, I'm marooned. Marooned! In 1066. Oh, Doctor. Doctor! Doctor!