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That's an interesting article @dominijk. I should addd that I faced the BB shell on mine prior to fitting the Shimano bearings to it.
Thanks @amey and @JurekB . A useful post here for reference on going down a shimano route
https://handsonbike.blogspot.com/2017/08/brompton-m6r-shimano-crankset-and.html But seems like a decision between stiffer cranks or lighter build but you can't have both