Inter-tidal dart estuary (both fresh and salt water habitats merging)
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Sorry, Blewit Boy, I did not see your ID before adding mine. I suspect you are right.
My Flickr photos...
The fish was also popping up to the surface (I presume to forage for food) and then rapidly moving off again. There were about 3 others in the same location. I would say torpedo is definitely apt!
Thanks for the ID, I'll update it now
The lips do look very thick; too much for the other species, on reflection. All the species behave in the way mentioned, so that is not especially relevant for ID, though.
PS: I'm not sure about the validity of copying and pasting someone else's notes, BB! ;)
Lat/Lng: 50.41367, -3.66447
OS grid ref: SX818584