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The key feature that means you can be sure of the identification are the four purple horseshoe shapes which can be seen clearly in the two more distant jellies in your picture. These are in fact the jellies gonads.
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
Lat/Lng: 56.7167, -6
OS grid ref: NM553654