Hi Marnus
Welcome to the forum! :D
I have a different car but When I turn the ignition on (not the Engine though) I have a glow plug light stay on for roughly 10 seconds before I turn the car or it will fully rev, this has been happening since I've owned the car for 3 year , a bit annoying but If you and Steve have the same car I'm sure he will be of great help :D
Kind regards
Bradley