They are correct, something external to WD is blocking its FTP functions.
wetyorkshire.org.uk is a valid ftp server address
Are other programs on that PC, eg the browser, able to access the internet OK?
In windows do:
Start
Run
cmd
at the prompt type
hit enter and tell us what happens.
What OS do you have?
Are you using Windows Firewall/Security?
Are you using other firewall/security software, eg Norton, Mcafee?