The Brompton "M" handlebar is ideal for small wheel bikes and I have one on my Raleigh Twenty. When used with an adjustable stem it gives the extra height and legroom that I need. This combination also distributes some extra weight over the front wheel to steady the steering.
You are right Sir W. I believe that these aluminium 'bars were fitted on the original Bromptons back in the 70's so it was hardly surprising when a small number started to fail under heavy use. Brompton modified the design in two different ways. The first was to fit a torsion bar across the top of the original 'bar. The second was to design a stronger handlebar. The later design can be identified by the dull anodised finish. The earlier ones were polished. I have used both.
Oops!
Oops, you forgot something.