Has anyone any idea what this is?

This strange looking post is next to Fobney Lock, it does not seem to be a trig point, does anyone have any idea what it is?

Photograph taken by Chris Houston on 18 November 2005 and was added to the database on Sunday the 19th of February, 2006

This photo is one of 5 of Fobney Lock No 105 on the River Kennet [Previous | Next]