wrote...
Bob Hobden wrote:
One thing, if you build it deep enough with straight sides you won't have
a
Heron problem as they won't be able to wade in it. Ours is a metre deep
at
the sides and although Herons have looked they always fly off empty
beaked.

Then you have to watch out for Kingfishers instead. :-/
(Although they're very pretty when they appear)

You only have a Kingfisher problem with small fish that they can swallow and
usually if the pond is deep enough and has something for the fish to hide
in, couple of pots on their side, they will dive to the bottom and hide as
soon as they spot it.

--
Regards
Bob Hobden
just W. of London