In article , pied piper
writes


organic matter on which the worms feeds can be as deep as two feet .

Yes, but it is not the same worm feeding on it!
There are several different genera and species of earthworm in the UK,
with different gut physiology depending on feeding habits. A surface
feeder does not have the digestive equipment to enable it to change to
feeding at depth.

Hope this helps and doesnt confuse you further Kay

I am not in the slightest bit confused!


--
Kay
"Do not insult the crocodile until you have crossed the river"