Tiscali.co.uk and downloading podcasts

Hello,

Over the past 3-4 days I've been unable to download podcasts using iTunes 7.1.1.

Podcasts either download extremely slowly (dial-up speed) and cut out without warning or displaying an error message.

In addition I'm unable to access the iTunes Music Store through iTunes.

I am using a MacBook Pro, running Mac OS 10.4.9, and X's built-in firewall. I have not made any alterations to or changed the firewall.

I can download other data and download podcasts using Juice 2.2.

My ISP is Tiscali.co.uk. Last year I encountered this problem and found threads in this site where other people have described similar problems:
http://discussions.apple.com/click.jspa?searchID=-1&messageID=2476232
http://discussions.apple.com/thread.jspa?threadID=473475&tstart=0&start=175

If anyone else is having these problems, or knows a solution, please post below.

Thanks.

- Richard