@narayani it was baking yesterday and we (individually and collectively) had a melt-down! There are some people trying to say that the beaches aren't really crowded and it's just the foreshortening perspective - but next day they took the shots from 'above' - and proved the point - and poor flat Noiriarty is quite amusing!
@narayani have tried to find where I heard it (reputable of course, or I'd have checked it out) but I can't locate it. Have looked online this morning and it's much less certain. Any clear bottle left in the sun can cause a point of light to be created (like a magnifying glass) and if its got alcohol gel in it then you can have an unstable vapour. But the suggestion that there have been several fires caused by hand sanitiser is much less clear than it seemed last night.