A bit fiddlie to get to. You can access the nut if you take the panel off the skuttle under the bonnet. What might work is to remove the panel (10+ sheet metal screws) at home as I think you can run without it. Then the nuts can be easily reached.
Unless my car's different it's much easier than that. Just remove the trim on the underside of the scuttle in the cockpit (Velcro) and the inner nut is immediately accessible.
