"It's been quite a long time since you left, then, for you," she interprets.
"I suppose it'll blend in slightly better than it did on the beach, at any rate."
She chuckles at his excitement. She thought he'd like to see it. "Well, that's up to you. We'll need to use your TARDIS to go to mid-June of 1977. At that time we were between caretakers and everyone was on sabbatical for the summer, so it should be completely empty."