GeoGraph - photograph every grid square

You feel like Moses parting the red sea if you stand at the edge of the causeway to Sully Island as the tide rapidly recedes - within the space of a minute this transformed from a body of water to something that could be crossed using walking boots rather than wellingtons! The picture was taken about half way through this transformation.

For some strange reason the water flow was going in the opposite direction to the obvious local water flow at this point - I guess this was down to wind direction and wave flow at the minute or so we were there.