|"Who Knows Best"|
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|Airdate||18 December 2004|
|Next||"Forsaking All Others"|
"Who Knows Best" was the fifteenth episode of Series 19, and the 461st episode of Casualty overall.
After finally enjoying herself while at the Christmas party things go back to bad for Comfort when she arrives home and finds Ruth has moved into her flat and she is homeless. Selena continues to harass Bex and Abs finds Sam tending to a patient.