This is the BBC in Warsaw, Moscow, etc, bla bla

If you listen to BBC World Service at the top of the hour you'll hear various variations of the idea "This is the BBC in (insert major capital city here). I wonder where this rebranding came from. One clue may be a spoof closedown of the old BBC Radio 5 (before it became BBC Radio 5 Live) on March 27th 1994. Listen to this Real Audio extract about 13 seconds in....