Okay I've been Googling for ages and haven't found an answer so I thought I'd ask the forum.
In the middle of the car park for the Michael Carlisle Centre part of Nether Edge hospital there is a cartwheel. The plaque explains that this is the site where the metal rims were made or fitted to the wheels. However next to the wheel is a large blue grating with a big hole under itwhich is intriguing.
My question is what is the hole? Old air raid shelter, some tunnel entrance that linked parts of the hospital together, does anyone know?

Not sure but I reckon we can find out.

BTW, Was it workhouse inmates who were making the wheels? Does the plaque say?

I've walked past the plaque today and didn't think to read it again so can't give a definite answer about the workhouse inmates. I'm sure it mentions the workhouse but then it also refers to the old gas lamp that stands there as well.
Still curious about the large rectangular hole though