A Country Doctor is a Doctor Who storyA strange set of circumstances for a group of people, a Doctor, and a companion named Rosa. Some weirdness due to being the first Doctor Who story every written, but still.
In The Castle, the "K" in the protagonist's name stands for KlammI haven't come across this interpretation either on Wikipedia or here, which kind of surprises me, because it seems the most obvious one.
- It's a believable theory, but not the most obvious one. Both in The Castle and The Trial, the "K"-named protagonist is pretty much an Author Avatar, so the "obvious" theory is that K stands for Kafka.