On Wed, 1 Sep 2004 16:48:42 +0100, "Mike Taylor"
wrote:

snip
Is the retaining wall on the boundary of your property? If so check with
your local authority. In most areas boundary walls NOT onto a highway can
only be at 2 metres (6') without permission.
snip

Actually *any* wall higher than 2 metres needs planning permission
whether it's on the boundary or not,

Cheers,

John