Inspector Morse: Fat Chance (1991)

Victoria Hazlett is a brilliant student who aspired to the priesthood in the Anglican Church. When she collapses and dies during an exam, the post-mortem reveals that she was likely poisoned, but the pathologist can't quite identify one of the substances found in her system. Victoria was a member of a group that advocated women priests and ran a shelter for women who required assistance in their life. Several members of the group feel that an anti-womens' group led by the Reverend Geoffrey Boyd is responsible, but there is little evidence. There is a link to a nearby weight loss clinic. Morse is quite attracted to one of the women in the group but is taken aback when he learns she lied to him about her whereabouts the night before Victoria died.