Rover 75 diesel auto gearbox issue

[Lincsls1]

Hi guys.
Does anybody have an experience of a full loss of drive from the Rover 75 auto box.
The engine is running fine, but when any position on the gearbox is selected, nothing happens at all.
No drive, no noises, nothing. Engine revs smoothly.
Trans oil level checked and OK. The cable and selector checked OK too.
The box is a Jatco JF506e.
Thanks...