The message
from Martin contains these words:

Hello,
Been digging in a garden about 18" down and found some long pencil thick
roots running horizontally.. I broke one and its orange/yellow in colour.

Anyone have any ideas what these roots could be ?

Ash ? My neighbour's ash has yellow roots up to 15 metres distant from
the trunk. They are in deep soil but run horizontally about 18" from the
surface.

Janet