I measured the voltage of the battery without the key in the ignition and it's 12.6.
When I insert my key and turn on the ignition the electrics work fine, the headlights come on etc.
When I turn the key there is a whirring / faint grinding noise for as long as I have the key turned. When I'm looking at the RPM gauge I can see it occasionally turn to around 1,000 but then drops down to 0.
I don't think I can hear any clicking, but I've never noticed one before either.