http://www.imdb.com/title/tt0090401/Superb, Haunting Version of Josephine Tey's masterful novel,
FLM interest: Victoria Bradley and Rebecca Bradley who play Jane Ashby and Ruth Ashby respectively. In the book they are 10 year old twin girls.When Alec Loding passes Brat Farrar in the street, he's struck by Brat's uncanny resemblance to Simon Ashby. Simon had a older twin brother, Patrick, who disappeared a decade ago, and was presumed drowned. Simon now owns the family farm, Latchetts, a top-notch stable. Alex asks Brat, who loves horses, if he'd care to impersonate Patrick to disinherit Simon. But as Brat grows closer to the Ashby family, he finds the role a dangerous and wearing one; especially as he begins to suspect that Patrick's death wasn't an accident.
The book of the same name, by mystery writer Josephine Tey, is one of my all time favourites. Even if this turns out to be VOT (although the girls have significant roles in the book), this is still something many of us here will love to watch.
This is very rare. My Googling has turned up very little. Perhaps the big guns here, with access to usenet and other sources, might have better luck.