About half a metre across. Any idea what sort of jellyfish it is? I wondered if it was a Lion's Mane jellyfish but wasn't sure.
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Yes, I think you should add that as your identification, then I can give you a spot-on. The large size and reddish colour mean it must be this species. I saw some small ones in Sark (Channel Islands) earlier this summer so it looks like it's a good year for them. Jellyfish typically vary enormously in numbers from year to year.
Lat/Lng: 55.5, -5.2
OS grid ref: NS0136