Thank you for your suggestion.

I also have this issue, but my Mac Mini is on 24hrs a day, so I imagine your script would only solve the problem from start-up. I hit the issue mainly when waking the screen from sleep.

As mentioned by UlfK, the default position of the mouse cursor is the top left corner of the screen at start-up and when waking the screen/computer from sleep.

Any advance to your script or any other help you could offer would be gratefully received.

Many Thanks 
Shaun.