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You are likely to get some assistance here IF you added a few notes about the sighting and perhaps added a starter ID.
Is it a slug?
We all want to help.
THREE MARINE PROJECTS
Can't help feeling, Ian, that you are wasting your time!
You probably didn't see my comment.
Pick up here where you left off - add weight!
Lat/Lng: 51.2, 0.3
OS grid ref: TQ6249