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The guys at Brompton Junction are really helpful. My seatpost had been slipping a lot, happened to be around Covent Garden one afternoon so I popped in. They looked at it and changed out the plastic collar - for nothing.
They loved my alternative riser bar and clamp adaptor combo.
The Marathon Plus is hard too beat. I have been toying with the idea of getting a set of the solid tyres from Tannus - a bit steep though.
http://www.evanscycles.com/products/brompton/rear-frame-clip-ec008815
Brompton Junction will fit for you, if you want.
I went in last week for the Seat QR as I didn't have that bit (6mm vs my old 8mm) and guy GAVE it to me for free.
I love you, man in Brompton Junction shop!