small jellyfish id needed

[captain nodge]

For the last few days now as the tide comes in there have been quite a few small jellyfish arriving up stream, most are a purpley blue, some are a dull yellow, and a few are whitesh, they be around 3 to 4 inches in dia and approx 6inch long inc their tendrills,, i tried to get some piccys but were not really of any use to help, some are being left behind on the mud when the water has gone not quite sure if they survive but are allways gone by the next tide, does anyone have any ideas what type they are and are they stingers, ta nodge this be in the south east near camber sands