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If all other electronics are operating properly when you push the start button including the brake lights with the brake pressed and start button engaged this can indicate a fault with the starter motor itself.The starter solenoid or motor can fail and cause this here and they are one component on your vehicle.I would start with checking for brake lights when pressing on the brake pedal with the switch switched on.If there are no brake lights at all this can indicate a fault with the brake switch itself needing replaced as this can cause this here.
If the brake lights are on with the brake pedal pressed then this indicates the brake switch is o.k. and this can be the starter motor itself at fault needing replaced.This would need to be tested further to be sure this is the cause here before having it replaced.
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I have seen this issue before and it can be any of the components above causing this here.I wouldnt rule out anything else like a possible electronic ignition switch (EIS) at fault as well but this will need to be tested to be sure then repaired from there.
The best place to have this tested and repaired is a dealer but if you have a local European auto repair center in your area they should be able to diagnose and repair the issue as well here.
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