Apparently, Jelly Fish UFOs are a thing. This archive document has a item described in the title. https://assets.publishing.service.gov.uk/media/5a79dfc9ed915d042206ba86/UFOReport2001.pdf
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19-Jun-01 18:00 Golders Green London Sixty – eighty jelly fish shaped objects that were white. There was also one single, pulsating red light amongst them.