Brompton Seatpost Quick release - J.C. Lind Bike Co.
Supplypost|brompton Aluminum Seatpost - Adjustable Two-section For Round Rail Saddles
Brompton Titanium Seatpost - Huckleberry Bicycles
Jtek Titanium Seat Post for Brompton - Jtek Engineering
Amazon.com : Standard length Seatpost for BROMPTON in Silver : Sports & Outdoors
Brompton folding bike - Seat posts - YouTube
So I've just replaced my telescopic seatpost to this alloy one that's a fraction of the weight (470g savings!). Yet to take it for a spin, but any major cons I need
Telescopic Seatpost Snap-Fit Black | Brompton Bicycle USA
Brompton Seatpost - steel - BikePartners Bike Shop
Brompton Telescopic Seatpost Mod | selfaware soup
Seatpost Steel Extended 60mm Silver | Brompton Bicycle USA