Google's webmaster guidelines are broken
Looks like the technical gremlins have struck at the UK URL version of Google's webmaster guidelines.
These 'Learn more...' options attempt to link through to:

There are no such pages.

http://www.google.co.uk/support/webmasters/bin/No. 1
http://www.google.co.uk/support/webmasters/bin/No. 2
andhttp://www.google.co.uk/support/webmasters/bin/No
. 3
.
There are no such pages.