Hub locking Tool ?

[97_gq_lwb]

there is a nob in the dash which is half hanging out, would that have been for auto hub locking that once may have been fitted?

That is idle adjustment pull it outward to up the idle then clockwise to lock it in position.
Anticlockwise to unlock it and let it go back in.
Handy when warming up the engine or when tackling rough stuff off road once locked you can keep a slow steady speed without touching the accelerator pedal