The message
from "Nick Wagg" contains these words:

Does anyone know of a disc of British bird song? Not one
of those with musical background - or dreadful shrieking choir -
but genuine, honest to goodness birds singing their hearts out.

IIRC, the RSPB web site has some for sale.

I have one recorded by Ludwig Koch, but it's not for sale.

And it is unlikely to be in the current releases. You could google for
one though.

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
http://www.users.zetnet.co.uk/hi-fi/