Another large organization is tentatively trying out the blogging waters: BBC Getting Into Blogging (Neville Hobson, Expert Author, Published: 2005-12-09)
The blog is located here: http://blogs.bbc.co.uk/nickrobinson/
From the domain name one can conclude it's going to be a general blog operation used by the BBC. However at the moment Nick Robinson is the only blogger and he says this is a tentative experiment.
The webpronews.com article points out the BBC had someone blogging earlier in the year, but not on a BBC-owned site.