My previous employer joined and even when I got a login I saw no benefit to me.  They had some resources but nothing I wanted to use except things you had to pay for such as posters.  Now the posters were not at all expensive but as it would have meant navigating my employer's purchasing procedures it wasn't worth it.  And why use BSC guidance when HSE guidance is both freely available and authoritative?

I think there was a discount on training.  We did get some staff training which didn't get particularly good feedback from staff, partly because it was so generic, not tailored at all to our type of organisation.

The only other thing we used it for was to say their information line was available in case of my absence.  I don't think it could have replaced me though in answering safety queries!

I left before renewal came up, but had I stayed, I would have argued against renewing.

So ... that's a "No" from me.

Nice piece of reception decoration at significant cost - and unlike ISO certificates nothing your competitors can make business capital from if you choose to leave.