Saw yonks ago GD eco home where they used a light pipe to get natural light into an underground room. Searched archives but found no ref for where to buy them. Anyone know?

I seem to remember seeing adverts by companies making/selling sun/lightpipes in several of the self-build magazines available (Build It etc). May be a good starting point?

"Google Search" for them. There are quite a few companies manufacturing these light pipes.

Thanks - found what I was looking for - wasn't sure what to call them but you seemed to know what I was talking about from 'light pipe' so used that and trick done.