There is a Ferro Concrete Petrol Barge (PCB), or Lighter, in the Harwich area. These were originally built for use on D-Day but were found to be unsuitable.
It is (85’x22′) and was in the cutting to the East of the Sailing Club serving as the clubhouse until replaced by LBK6. It was then moved a few hundred metres to its current position off the jetty, presumably holed, to serve as a breakwater: Westerly winds in the Stour can be unpleasant, even dangerous.
