UK Athletics has published the selection policies for the following Championships;

• 2021 World Mountain and Trail Running Championships, Chiang Mai, Thailand, 11-14 November (Trial information for mountain running can be found here, and info for the Trail here)
• 2021 IAU 50km Championships, Chinese Taipei, 31 October 

• 2021 IAU 24 Hour Championships, Bucharest, Romania, 2-3 October 

The full selection policies can be found HERE.