Friend and Italian bike aficionado Steven Massland has supplied the answer.
This shows the mechanism fitted to a Taurus bike but the Bianchi has to be similar.
The purple/yellow parts are to the rear brake and the green parts are to the front. Quite simple when one knows how.
Still quite a caper for the mechanic to assemble however.
The Bianchi was rather more complicated as the brake stirrup was mounted on the seat stays and the connecting rods went through the b/b and up the seat tube instead of exiting the b/b as on this Taurus
The front brake on the Bianchi is somewhat more complicated too as the connections are hidden within the fork crown and blades before exiting at the stirrups. Taurus is cheating a bit here.
Details of the Taurus bike can be found at: http://biciclette-taurus.blogspot.com/2009/03/la-taurus-modello-19.html
Many thanks to Steven Maasland for his help