It's been here all day
Visibility here has been moderate at best, Camborne's reporting poor most of the time, and it's been dust not low cloud. It's been difficult to make out the patches of cloud through all the mirk.
There have been reasonable spells of sunshine, 5 hours at nearby Bosullow, but it's so weak & milky. Barely see the shadows. Line of showers slowly approaching should bring some of it down
Last time it made the sun this feeble was in April 2011, but on that occasion virtually no shadows (and no cloud) but visibility good at sea level. A strange eerie colour and really low light for a near cloudless day.