Season 1 car is a 1973 Jensen Interceptor Mk II. Season 2 car is a 1968 Bristol 410. One of only 79 made.
Lynley can be seen locking and unlocking his driverside car door in virtually every episode, but never touches the passenger door when a passenger gets in/out. They are all classic cars and don't have central locking.
Three different actresses played the role of Helen Clyde/Lynley.
A remake was aired in 2025 entitled Lynley.