The Speed D7 is a new contender from one of our favourite firms, Dahon; and its latest bike ticks all the right boxes. It is simple to unfold and has by far the best locking system here. What's more, it's a good size to ride, and offers varied saddle and seat height adjustment. As well as being light and collapsing into a compact package, it has well spaced gears and a decent price. Our Best Buy.