The Doctor's just come back from the other world. The war is over, Arthur is dead. He's tired, and thinks he needs alone time. The TARDIS disagrees, and has taken him to South Croydon, because she knows that Sarah Jane's laughing and teasing is actually what he needs.
OOC
http://merlin-doctor.livejournal.com/3249.html
The Doctor's just come back from the other world. The war is over, Arthur is dead. He's tired, and thinks he needs alone time. The TARDIS disagrees, and has taken him to South Croydon, because she knows that Sarah Jane's laughing and teasing is actually what he needs.