Explored with myself
Having previously tried this but failed due to low battery in the torch and a flat battery in the camera I gave it a miss.
Never got off to the best start as I reached the outfall to discover I'd left the torch in the car so it was back to the car.
outfall, its a significant stoop
down to the Infall now I've got my torch! a short 6ft box to begin.
Ghost in the culvert
The short, nice looking culvert 5 ft dropping to 3-4 ft.
between the nice section and the boring bit.
the main, boring culvert 4 ft here
3 ft RCP (never went up here) about half way along
A little on was surface access with lots of spiders and providing respite from the stoop. managed to get in sight of the outfall but, water levels had risen to around a ft and with just wellies that was a bit too high! combine that with what felt like a reduction of culvert hight (guessing it was down to 3 ft due to debris) it was here that I turned back, with that previously mentioned surface access being used for a bit of more respite.
Intresting floor though, gravel but seems to be embedded
Illegible poster from the box culvert association at the 6 ft culvert