The Doctor

There are quite a few hospitals scattered across the greater Cardiff area, and voluntarily or not, the Doctor knows most of them. He's been a patient in the three most central ones, and has been to most of the ones in more outlying regions, either for outpatient care or to visit somebody. So when he received a three-am-phone call from Spire Hospital earlier that night, the shrill ring of the telephone jerking both him and the Master awake, it took him a few moments to figure out that apparently, there is a hospital in Cardiff that had so far evaded his attention.

( The reasons for his ignorance became clear . . . )