Ok, looking at old maps, the shoreline hasn't been significantly changed suddenly at any point, so this is not reclaimed land like I always thought it was.
Another option is that the council just dumped a load of hardcore on the shoreline to reduce the erosion, which is a significant problem there. This is an exceptionally poor solution. I think new ferry suffers from undercutting, where the base eroded and the land about 20ft back from the edge tries to slip down and under the front edge.
There seems to be loads of documents mentioning erosion management and including new ferry as one area of action, but all the details refer to other areas and ignore new ferry.
I'll get a bigger spade out after and see what I can dig up.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates