At last I know one. Its the Liverpol Landing stage. It sank on March 2nd as anticipated. Anyone who tells you it was a freak wave probably works for Peel holdings who didnt bother dredging underneath it so that it broke its back on the extreme low water we had that night (minus 0.2m) The photos show thstage disapearing below the rising tide the next day. The porta cabins were my place of work, Merseyside fire service Marine rescue unit (formerly Mersey inshore rescue)