I used to be safecontractor and found it a waste of money in the end. I only joined because a hotel chain i cleaned for said they wanted all their contractors safecontractor accredited. Then when a lot of contractors like their plumbers and electrical guys said they wouldn't join they changed their minds and let them carry on without it. The scheme would be worth it if everyone who was accredited were only allowed to use accredited contractors, but unfortunately it isn't a requirement to and can still use anybody which makes it worthless. Unless it has changed a lot since 5 or 6 years ago, you only had to provide examples of risk assessments, method statements and safe systems of work, which you should send with every quote anyway.