Thicker Than Water (1993)
Debbie and Jo are identical twins. After Jo is killed in a car accident, Debbie starts to act increasingly like Jo. Mysterious circumstances lead Jo's widower Sam to suspect that the accident wasn't an accident at all.
Cast
Theresa Russell
Debbie / Jo
Jonathan Pryce
Sam
Robert Pugh
Paul
Catherine Neilson
Chloe
Richard Lynch
Dorian Phipps
Alan David
Chief Superintendent
Crispin Letts
Nastygram
Jack Waters
Mini-Cab Man
Rhys Parry Jones
Charge Nurse Howard
Lisa Palfrey
Young Mother
Martin Troakes
Ellis
Grahame Fox
Dalton (uncredited)