I have checked the fluid level which was fine. The solenoid replacement is a strong possibility. recently a nearby Indie mentioned the possibility after I described the symptoms, so I think I will give it a go, as otherwise its a great car! Question for Mike which is the TCC solenoid on the valvebody pics?

Thank you both for the help.
Jim

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2003 X5 3.0 - 200K
2019 Subaru Forester - 80K
1986 Merkur XR4TI Intercooled - 160K