For some reason which is not immediately obvious, the Brompton is quite incredibly fast. I find myself whipping past younger and stronger riders on it and I just can't see any reason. It has a 3 speed hub gears, little wheels...why should it be so fast? It's light but weighing in as I ride it at 12kg, not unusually so.Brompton for the same reasons as you lemmy and by far the best bike I have ever owned.
Any ideas, Flecc? It's an oft noted characteristic of the Brompton, there must be a reason.