Hello Kevin,
I feel sure that this has been covered in the Forum somewhere.
Have you changed your tyre and/or wheel sizes during the last year ?
I had the same alignment issue, and acquired a printout on the method.
It is a simple process, but you will need a level area, a vertical wall, and a length measuring device for the distant from/to the wall.
Most MOT garages should be able to do this for you in a few minutes.
I'll look for my printout, but doubt I will find it; I have several hobbies and many filing 'systems'.
You could search Chris.ac, as he is expert in electrics.