This vessel is Lambeth, a 13.5m catamaran that is used by the Port of London Authority. New in Summer 2009, it is the first of four new vessels for the authority, each of which is named after a London bridge.
This yellow and white jet ski has yellow and green checkers up the sides as well as a blue strobing beacon mounted on the front. It was spotted in Portsmouth harbour and is used by the Queen’s Harbour Master volunteer harbour patrol there.
This is a Harbour Master vessel called Westbourne. It is operated by the Port of London Authority on the River Thames. Notice the twin blue lights on the roof of the cabin.
This is a Harbour Master survey vessel. It has striking yellow striping on the port and starboard bow and a blue flashing light at the top of the mast. It was spotted on the River Ouse in York.