<prompt> Ngwala tšwetšopele ya serapa se - Allen Walter Stonex 20 April 1917 20 February 1983 e be e le mmapadi wa paesekele wa mothaladi wa New Zealand yo a emetšego naga ya gagwe ka 1948 UCI Track Cycling World Championships  <response>: le Dipapadi tša Mmušo wa Brithania tša 1950. 