Actually John - the link you posted was this -
http://www.mudcat.org/www.topic-folk-club.org.uk
It doesn't work because it is trying to find www.topic-folk-club.org.uk inside the Mudcat web site.
Try using the Mudcat Link Maker where it says
Make a link ("blue clicky") below the "message" box.
Quack!
GtD.