The message
from "Tim" notachanceunlessyouremovethis.twstannard@ntlworld .com
contains these words:

Im just digging out a new bog garden. Soil is heavy red clay, with about an
inch of half decent soil on top.Can I use the red clay and top soil IN the
liner, thus avoiding the cost and pain of disposing of the spoil from the
hole?
Please say i can use the spoil! )

Course you can; clay is both fertile and water-retentive. Sticky wet
clay should be a welcome feast to many bogplants. I'd try to mix the
topsoil in, plus some compost, as you re-fill the hole.

If it's a low-lying soggy area of garden, your clay-ey bog garden
might not even need a liner.

Janet