The Doctor grinned at her as she complimented his collection. He did tend to acquire things, and useful things at that. Besides, his TARDIS was splendid when it came to accommodations, right on down to her library.
"Go on then," he said when they reached the Welcome Center and Romana made her offer. "I'll be here once you've got it all. Then it's just a quick hop-skip and step 'round the corner to the TARDIS."