I remember watching a tv series about a group of English and Australian women in the Philippines in WWII, who were captured by the Japanese. Tenko is too early. (And the title is not familiar to me.) I’m sure this was late-'90s at the earliest. And I’m sure Jenny Agutter had a role. But I’m not finding it.
Perhaps the 1997 Australian film Paradise Road, which starred Glenn Close?
A Town Like Alice (1981) except I see no evidence of Jenny Agutter.
Paradise Road is an Australian war film about a group of English, American, Dutch, and Australian women who are imprisoned by the Japanese and the atrocities committed.
Features Glen Close, Frances McDormand, and other stars, but not Jenny.
Jenny famously played Nurse Alex Price in An American Warewolf in London.
That was going to be my guess.
That’s the one I thought of immediately when I saw the thread title.
Also Malaya rather than the Philippines. And much of the storyline was post war, about Jean, the leader of the women. In a frame for the ww2 story, Jean receives an inheritance, tells the solicitor about her years in captivity and use the inheritance to help a malay village where the group stayed after their only guard died from disease. And later goes to Australia to do the same for an australian hamlet a friendly australian soldier had told her about.
Jean is played by the english actress Helen Morse, who don’t look particularly like Agutter. But perhaps a bit closer (ouch) than Glen Close.
There was also a 1980s TV movie starring Susan Sarandon called Women of Valor. What I really didn’t like about that one was it made it seem like it was telling a true story but it was actually all made up.
Could it be Tenko? It was about British, Australian, and Dutch women captured after the fall of Singapore to the Japanese in 1942? (No Jenny Agutter, though.) Tenko (TV series) - Wikipedia