...but I'm interested that Brompton claims they have designed this hub. ... but I'm guessing it is in fact a Sturmey with different ratio gears and Brompton's marketing is overstating their effort...tcs
To put this speculations further: at the Sturmey booth at Eurobike they told me that brompton was closely involved into design process - and testing-period, that they paid for research and tools and that in return SA is happy to let them do the introduction into the market. That SA will like "not sell it to dahon" at least for the next few years.