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General improvement, the new levers and brakes are worlds apart from the older style levers and brakes that I presume you’ve got in yours. Newer ones are far more comfortable, much greater modulation and power and far less flexy in my view so that’d be my first upgrade. May need to be careful on which brakes, as I think they have gone from 5mm bolt to 6mm bolt but careful drilling will open up the fork and frame mount 1mm to fit them (Brompton suggest this themselves!)
I have a really old 3 speed (pre-2010 I think) with M bars that is in sound order, what sort of upgrades would be worth considering to save a bit of weight or indeed just for general improvement.
I’ve recently changed the tyres and already have some lighter pedals. Though I think I was too optimistic with the pedals and they are actually a bit small for me - they have a very small platform.
I also need the telescopic seatpost, so not so easy to save weight there I think.