the BWR hub and the 1&2 speed hub use the same cogs ..

someone mentioned a 3 titanium cog kit made over in your part of the world
to replace the 2 on the 9 spline driver..

An earlier hub for their 6 speed was sourced from Sachs in Germany It used the 3 spline cog in 3/32" thickness .
a 13t & a 15t.. the 15t skips a few teeth, as shift gates

Sachs was Bought out by Sram , and the tools in the factory were shipped to Taiwan.

So, those hubs are no longer made , which is why Brompton has the New BWR,

from the new owners of Sturmey Archer , also on the same Island.