Does the interior light come on when you open the driver's door? Often that and the fuel flap have the same cause - a microswitch issue in the door lock. The car doesn't recognise that the driver's door is open so it doesn't activate these functions. @timmus has sorted at least five of these in the last two weeks at my place. If that's what's happening on yours, I'd seriously suggest grabbing one of the last available slots in early July. Meanwhile as a workaround, you can pull the cover behind the right hand rear light cluster. That will allow you to access the rod from the release solenoid, pull it down to open the fuel flap.