Where can I get British Standards?

Could you please elaborate on how one can obtain British Standards? I'm particularly interested in understanding the avenues through which these standards are typically accessed, whether it's via online platforms, physical distribution centers, or professional associations. Also, I'd like to know if there are any specific requirements or qualifications needed to gain access to these standards, such as membership in certain organizations or payment of certain fees. I'm seeking clarity on the entire process of acquiring and utilizing British Standards in my work.