Played by Caroline Catz
Pretty Portwenn primary school teacher Louisa takes an immediate dislike to Dr. Ellingham's presence, but after realizing his talent as a doctor her revulsion turns to curious attraction. Although it's clear that Dr. Ellingham finds Louisa attractive, his social awkwardness and inability to express emotion causes problems in their budding relationship.
Catz began acting in the early 1990s, initially playing minor roles. On registering with Equity, she discovered that an actress with the name Caroline Caplan was already registered, so she had to choose a different professional name.
In 1994 she took a lead role in the BBC's All Quiet on the Preston Front, which ran for three series. She followed this with a spell in The Bill as Rosie Fox, during which she met Michael Higgs, who later became her husband. Her part in The Bill was the first of a series of three long-term roles in which she played police officers - The Vice had her demoted to PC, whilst in Murder in Suburbia she was a Detective Inspector. She is currently starring in ITV1's Doc Martin, where she plays primary school headmistress Louisa Glasson.
Catz has continued to appear in one-off roles, including In Denial of Murder, in which she played real-life murder victim Wendy Sewell, and in an episode of Hotel Babylon. She also appeared in a two-part episode of Single Handed entitled The Stolen Child as Dr. Maggie Hunter.
Caroline Catz's IMDb page