[1] It administers triathlon in England, Scotland, Wales, the Channel Islands and the Isle of Man.

The BTF also selects athletes to represent the national team, at races such as the world triathlon series and the Olympic games.

[2] However North Irish athletes may compete for Great Britain as long as they have a valid British passport and are a member of one of the three home nations associations.

A large selection of supporting partners give corporate sponsorship to BTF.

[8] It is responsible for such matters as Great Britain’s international representation in the sport, Great Britain's Elite and Age Group teams, British and international events, all matters relating to doping and various other administrative functions and services that the three Home Nations share.