Colin,
interesting. I see that there was a 1,000-lb "N" cluster scheduled for bomb ballistic trials at Woomera in 1955. Contained 52 x 10-lb bomblets. Apparently an alternative to the 1,000-lb "N" bomb. I'm sure I've also seen this weapon referred to as the "Toxic bomb" - I suspected an Anthrax bomb. But maybe the same weapon you refer to ?
Do you know whether they actually produced the 10,000 bomb casings ? I've seen huge orders for other bombs in same period and most ended up being cancelled before production.
rs