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Mikey5000
Buy the kit for both of the above from Minimods via bike gang
https://www.bikegang.co.uk/bikeganghut/Brompton-Stock-Integrated-2-speed-thumb-shifter-to-3-speed-indexed-mod-kit-MiniMODs-p431344504
https://www.bikegang.co.uk/single-post/2-speed-to-3-speed-external-cogs-upgrade-in-detail-minimods-x3-unibody-cog-set-or-x2-1
Plus you'll need a 9sp chain