Looking at the big photos on the flickr pages linked from the auction, the rear frame and forks aren't Ti - you can see the gold/brass brazing around the joints. I guess it'd be pretty hard to add v-brake bosses to Ti parts unless you know someone that can source/ fabricate and then weld on the parts.
Always nice to see a nicely modded B - It looks sweet with those low-angle riser bars and aeroheat rims...
Low gearing though. Spin much?
PS - 'Greens' are made directly for Brompton by an undisclosed supplier.