How to get good Health & Safety advice

Health and Safety is becoming more and more part of workplace culture. But how do you choose where to get good advice from?
 
I read the following at the Government website business.govt.nz on advice when choosing a HS adviser : 
 
Can I get a quote first?
If you ring a plumber for help, you ask for a quote first. The same goes for H&S consultants, so shop around. Just remember, cheaper doesn't mean better. Whoever you go with should still have the right experience and qualifications. 
 
Can I see examples of your H&S work for similar clients?
Ring a few advisors who seem a good fit for your needs, and ask if they can give examples of similar H&S work they've done recently. 
 
Can I check your credentials?
Unfortunately, not all H&S advisors give good advice, or are even accredited. Before handing over money, check that they're competent to advise you on your particular H&S needs. 
 
Can I contact previous customers?
Make sure your advisor can do all they say they can do. Check if they have a history of providing practical H&S advice that supports business operations. Getting recommendations from other customers is a good way to go about this.