tcs #2918 above: Wow that's all really informative pics, thanks. The Curl is cheating a bit in having the seatpost off versus the Brompton, but still impressive size, however having the seatpost off means it is not used to lock the fold in place like on a Brompton (a brilliant design feature), instead probably relying on magnets.

The Caracle looks impressive on 20" wheels and is new to me, I will look that up.