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The 2-speed tensioner-cum-mech is a nasty plastic piece of shit that doesn’t work very well to start with, and then begins to give up the ghost if you so much as give it a filthy look, let alone ride with it in filthy weather; the partly metal tensioner used for 1 and 3 speed actually works okay and doesn’t look like it’s designed for a toy bike; and a single gear is always enough when push comes to shove. Always.
I've never seen the point of singlespeed on Brompton over 2 speed as you have to have a tensioner anyway and the weight difference is negligible