On the second leg of the Vertical World Circuit a record field of 1,200 runners turned out for Thursday’s Vertical Rush on London’s Tower 42 to raise money for Shelter, the housing and homelessness charity.

In 2012 skyrunning is 20 years old.  From a handful of valiant pioneers in the Alps to an international federation with 21 member countries and a worldwide circuit, skyrunning has come a long way...