Go N.Wales.
Re adjustment, I would presume you need C Spanners as with most other makes of Coilover.
Thus;
There should be one or two of these and will allow you to rotate the ring at the bottom of the spring;
Forget the yellow pointer/circle, copied from Google, its the red adjuster on the spring that goes up and down as you turn it.
Jamie
Edit; just noticed it is pointed using the green arrow.