Pete the BMS is the same tie sans the dumb bell eye as the hammerhead, it has a glass or tungsten bead instead. The are both flies of the late Muz Wilson. They are great flies for our Australian bream that let you work the water column. They work great on a wide range of fish due to the tail and translucent halo of the dubbing. They are light but appear much bigger. It is a supper simply fly that can be adjusted based on dubbing and ribon used.
These articles will give everyone more
http://www.flylife.com.au/library/articles/40/40.html
http://www.flyangler.com.au/pdfs/bream_flies.pdf
SBS for the BMS, just found this one and it is great!
http://m.youtube.com/watch?v=o7DmOJTUR-I
Hope it adds something to the box for you guys.
I guess that answers the second question too. I live in the SW of Western Australia having moved from the climes further north late last year near Exmouth.
Adam