In article , PJ
writes

Self repairing and very little maintenance IMHO as well.

Hmm.

Sound insulation is
excellent.

Not as good as solid brick

If you want privacy the hedge can be let grow to 7 feet even
without causing offence, whereas a wall that high will just look appalling.

And require planning permission
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/edward/index.htm