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@citygent
S3L-X here.
When picking between S and M I'd say test it. Ideally for a few days (Brompton '3 cog' dealers now have Demonstrator models they can lend you for a few days against a deposit).
Gearing, just go off your current bikes. I'd say 2 speed is fine for most people, I went for 3 because I want to use the bike for not only completing rail journeys, but also as my main commuter. I need the 3rd gear on the long straights my current commute has. I could've probably been happy with 2speed 'raised' gearing but... I dunno, I just like having that range and as I have a ti one, it's not a massive weight to carry around.
Oh yeah and firm suspension and a bag is a must. I also changed the saddle for something less sofa.