The photo accompanying this post shows how magical this afternoon was. After a morning swathed in dank fog, we set out from the still-foggy coast to climb through the forest above Blairmore - and came out into the last of the light as the sun set. The whole of the Firth of Clyde, as far as we could see in all directions, was swathed in fog, with the Inverkip Power Station chimney half its usual size and the hills above Gourock cut down to mere bumps. It felt like being in an aircraft - or, as Rob pointed out, like The Day After Tomorrow.
You can see the rest of my (phone) photos of the view by clicking on the one here.