Two of my other non deer stalking businesses are safe contractor registered, but the shooting one isn’t. It’s mainly aimed at the construction industry in truth so I am not even sure there would be a category for shooting at stuff.
For my engineering businesses it was fairly easy to achieve, but this is due to the systems already in place for those companies. Just off the top of my head you will need:-
Company policy documents for pretty much everything from diversity to the environment.
Risk assessments for every actively.
Method statements.
Construction phase plan example, although how you could write one of these for stalking is beyond me.
Certifications for things like stalking plus manual handling, first aid, working at height etc.
Calibration certs for tools. Again god knows how this would work for shooting.
GDPR
Company insurance. Not BASC actual business insurance.
I can probably help out with some of the above if you get stuck.