Jenny Randles' "UFO Casebook" column in issue 278, September 2011, of the Fortean Times magazine (p.29) looks at a report coming from a commercial vessel off the west coast of Scotland.
On 22 October 2010 at 1945hrs two crew members noted an object "...over the water, glowing bright but moving in an extraordinary manner - diagonally to them at speed...Its speed was equal to the fastest aeroplane but more maneuverable than a helicopter. In total it was "...present for about ten minutes before vanishing."
In looking first for a conventional explanation to account for the sighting, Jenny found that a Royal Navy submarine HMS Astute was stranded on shingle banks off the West coast of Scotland at the time of the UFO sighting. "The sub had secret stealth technology aboard which was under sea trail." "Any surveillance craft - either from our own military or from some foreign power - would have had good reason to be crossing this part of the ocean heading for the location of the stricken sub."