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@dmcg
I know that there are some Bromptonites here, so I thought I'd share some progress on a little project to run 3 cogs on a standard Brompton hub.
The essence is to replace the 2 current sprockets with Shimano 10-speed ones. It's letting me run 12,13,14 x 54 which is fantastic for commuting.
I'll upload some images to view inline if anyone is interested, but in the meantime instructions are here.
If anyone tries it please let me know how you get on - I'm interested to see if it works on other bikes, and in particular the BWR hub.
Cheers