bbc.co.uk:Can't download rtsp:// RealMedia .rm and RealAudio .ra files from BBC radio

Hi. First post here, so be gentle..!

I'm trying to download a Real Media stream from the BBCs Listen Again pages (bbc.co.uk). I've got a link to the .rm file (rtsp://rmv8.bbc.net.uk:554/radio2/r2_genesis.ra) but when I try to put it into WackGet (or any other download manager I've got) nothing happens or I get a message like "The requested download could not complete".

I'll admit to being new to this - I got the link to the file by using URLSnooper, but now I'm stuck.

Also, the BBC take the link away after one week, which is this coming Saturday!

Any help much appreciated.