Ahh, your on NTL then ? :-)
There is a problem with NTL customers, NTL have Yahoo down as a spam site & is doing some blocking of it or something.
I think changing your proxy server can fix it but that's another longer story.
Try pasting these in your browser.
http://groups.yahoo.com/group/hyndburnfreecycle/ is the Accrington one.
http://groups.yahoo.com/group/burnle...ndlefreecycle/ is the Burnley one.