Some dark grey to black coloured objects were observed appearing, congregating in random shaped groups, becoming more visible (darker) then either moving away or fading away from sight. they were observed by 3 people for around half an hour and i took a few snaps on my iphone. i took a couple using hdr (with normal on) as well, and found the objects had moved slightly in those consecutive frames! a jet had passed over as well and my husband took photos of the vapour trail that revealed a couple more, which weren’t noticed when the photos were taken, only after when i reviewed the images. it was as if they were using the cloud cover to hide in. prior to taking the photos larger groups had been seen, some as low in the view as between and just above the treeline. however i believe they were some distance away and definitely would have been over the sea. as dawn became brighter i could no longer see any ‘dots’.