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Maybe a compass jellyfish?
"Translucent yellowish-white jellyfish with brown markings around the fringe and on the top of the bell. Those atop the bell resemble a compass, with V shapes radiating out from a central point."
"Common off Southern and Western coasts of Britain in summer months."
It's definitely a compass jellyfish, loads of them around the west of Ireland coast. Saw one swim past me when I was at the beach last week. It was worrying but apparently their sting is quite mild. Not sure on what scale tho!
Looks like you're right! Spot on.
Really interesting to read about :)