Economic models that fail to accommodate this reality are likely to meet their Waterloo in Africa.

FORBES: Poor Infrastructure Is Africa's Soft Underbelly

As if to dismiss that as too simple a challenge, according to press reports of the day, he then flew under at least three other, much lower, bridges - London Bridge, Blackfriars and Waterloo - before stepping ashore at Westminster to be greeted by a cheering crowd who had gathered to meet a dignitary expected by boat from Paris.

BBC: Frank McClean: Forgotten pioneer of the sky