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Bromptons have a lot of moveable surfaces and specialist parts, and are renowned for squeaks and rattles which can be notoriously difficult to diagnose. I've worked on more than I can count over the years (am also Brompton-trained) and the places to look initially are the hinges, the seat tube collar, the saddle clamp, the r/h crank (the swaged flange where the crank arm joins the actual chain ring can fail), the rear triangle pivots, the expander bolt in stem fixing (in the head tube), and that's just for starters! It's very hard to to try and diagnose over an internet, so a good LOCAL dealer is the best place if you can't find the cause. Brommies also need regular servicing - they eat chains and sprockets, for example. Good luck!
jj72
Yeah that sounds similar. Good thinking with the hinge clamps. I've got the standard Brompton U-shape hinge clamps but Ti clamp bolts. Will try greasing them and see if it gets worse :)
I did wonder if it might be my chinese Ti bars, but I can replicate the sound when holding onto the stem and not touching the bars, so guess that's not it either. I've also checked that everything attached to the bars is secure.
Another thing I've noticed recently is that it squeaks only in the 12t gear. I've lubed the chain, the mech, jockey wheels and everything else I can think of. That tends to come and go too, usually happens straight after I shift into that gear then seems to calm down.