only came across sluice four rather late in the day and a real
nightmare it is proving to be. I had to clear a lot of undergrowth,
including some particularly nasty briars and the whole thing,as well as
being the largest construction is also in an especially parlous state.
The planning process is proceeding quite slowly and cautiously. However
this sluice shows the best evidence for a least three periods of
rebuilding, the latter most seeing the original timber gates replaced
with a solid concrete block, now partially broken through, which echoed
the original configuration. The outer face of the north pier has a
particularly alarming lean to it.