British Standards are expensive, but there's a way you can use your library to access them free of charge. And you are allowed to take notes. You can't copy whole pages etc - that's breach of copyright. But you can take lots of notes.
While you're here, would you mind checking out our Electrician's Insurance section to see if we could save you a few quid? - Specifically our Van Insurance Deals and Public Liability Insurance Deals. Thanks for supporting the forum!
British Standards for Free BS5839-1 and BS5839-6
Get British Standards Online Free of Charge!