Full details of these competitions can be found on the PAGB Central Entry System (CES). https://pagbhost.co.uk/main/main.php
A Club entry requires a personal CES account with Club officer approval. See here – http://www.thepagb.org.uk/services/the-entries-admin-system/
See also guidance at http://www.thepagb.org.uk/wp-content/uploads/guidance_image_repetition.pdf