Great Aunt Diana - S3.E10

The residents are getting wet waiting for a bus but when it arrives the driver claims that they cannot get on for free for another four minutes as they are too early, so Diana hauls him off the bus and Tom hi-jacks it on behalf of the residents.

Later this will come in handy when a very pregnant Sarah arrives, seeking Diana's reluctant help to deliver her baby. Ultimately a girl arrives, unsurprisingly, Sarah calls her Diana.