how long ago were those taken, Duncan, as a vessel very similar was in the river at Fleetwood two days ago, but could only see the top half of it showing the wheelhouse and top of the twin "cranes".....of course there must be more of these vessels as there is a big wind farm in Morecambe bay, and expanding, but just unusual for pics of one to be posted, operating at the opposite end of the country to another being sighted, having never seen one before.
Jim.