The actresses who play Mandie and Poppy are sisters in real life. They're played by Emily and Daisy Head, the daughters of actor Anthony Head.
Bacteremia VS septicemia. Bacteremia is the mere presence of bacteria in the blood, usually because some localized infection has leaked a few bacteria into the blood stream; it is not particularly serious. Septicemia is a bacterial infection actively growing in the blood stream; this is very bad.
FYI: borborygmus, is the noise your stomach makes when it rumbles.
Ian McNeice, who played the owner of the less-than-5-star Large Restaurant, acted in a previous British comedy series about a gourmet restaurant. In season two of the comedy Chef! (1993), he played the alcoholically challenged gourmet cook Gustave LaRoche in three episodes.