BFTA Rules are for the way a course is conducted. The hosting Club determines safety (as is their right and in support of their rules, regulations and insurance). There is a (mandatory??) safety briefing before the start of a BFTA competition (e.g. GPs) and all participants must attend (You have to question if any insurance cover applies if someone chooses not to attend the briefing and becomes involved in an incident).
In the BFTA Main Shoot Rules it states (17):
Guns will only be sighted, shouldered or discharged over a recognised firing line. Guns will always be kept un-loaded and un-cocked when not in use.
BFTA Secretary 2012-2014
CSFTA Secretary 2014-2016