I am relatively new when it comes to Bromptons, just got mine 2 weeks ago. I have a pair of SPD clipless pedals lying around. How hard is it to retrofit this to my Brommie? I though it would be a simple swap but then I checked the folding pedal and it looks like the bolt is non-standard. In my opinion, clipless pedals would be a nice mod to the Brommie because it can be difficult sometimes to keep your foot to the pedal because of the widely spaced gearing (I have the 6 speed version).