Brompton owners

I swapped my saddle for a much lighter one but it's also much lower profile and it made the already slightly too short seatpost wayyy too short....by the look of it though, you have a bit of room for manoeuvre in your seatpost anyway. In terms of dropping weight from the bike, I've cut at least 500g by replacing the stock steel seatpost with titanium, replacing the saddle with something half the weight and removing the mudguards, but in use the weight saving feels negligible. They are still pretty heavy, awkward things to lug about whether at 11kg or 11.5kg!