Audio transformer 1000 ohm prim 8 ohm sec - UK supplier?

Hi,
I'm trying to find an audio transformer like this one for sale in the
UK (or Europe):
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=273-1380

I've looked through just about all the online suppliers I can find
without any luck.
Can anyone suggest a dealer? If not, would a different component serve
my purposes? I'm building this project:

http://www.i-hacked.com/index.php?option=com_content&task=view&id=162&Itemid=44

Thanks for help.
Mike