A.W. Thompson became president of the League of Esperanto-speaking Scouts, and his brother K. Graham Thompson the Secretary of Honor. Thereafter, Norman Booth, another British Scoutmaster became secretary-general of honor and seceded with treasurer D.H. David to organize the Skolta Esperanto Ligo (SEL). This new association organized multiple international Scout camps to achieve its goals and to test the use of Esperanto in Scouting: in 1922 in the Netherlands, 1923 in Belgium, 1924 in Denmark, 1925 in Spain, 1926 in Czechoslovakia (there were even radio broadcasts in Prague about Scouting in Esperanto), 1927 in Spain, 1928 in Belgium, 1929 during the World Jamboree in England, 1930 in the Netherlands, a camp in which participated a SEL member, Harold Wilson, who would become Prime Minister of the United Kingdom from 1964 to 1970 and again from 1974 to 1976). Almost 100 Esperanto speaking Scouts from 18 countries, as far away as Japan, took part in the 1929 World Jamboree in Birkenhead.