Been with them for a number of years, the paper work you have to send to get accredited is a nightmare and seems to be gettin worse each year its basically the same health & safety questions just worded differently over and over again, we have a few large commercial jobs that insist on it but if it wasnt for them i would not bother as it doesnt really gain us that much work, but it is good to send off in the quotation pack looks good etc.