Career
Mepstead started fencing as an after-school activity. He took part in the 2011 Summer Universiade. They took another bronze medal two years later in Zagreb.
In 2014 he was drafted into the British World Class Programme ahead of the 2016 Summer Olympics.
In the 2014-2015 season he took part in the first edition of the European Games held in Baku. He studies geography and economics at the London School of Economics, where he was named a sports ambassador.
He also coaches part-time.