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If it’s basic parts like saddle grips tires, nothing, if it’s changing the make up of the bike i.e. swapping fork and triangle to run a Rohloff and disc brakes, Brompton do not endorse this and all warranty is transferred to Thorn Cycles trading as SJSCycles.
You obviously also have the product warranty, so Rohloff warranty, Vostok/kinetics warranty etc.
M14D coming soon!