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The step doesn't eliminate the need to work at height , so how can it be collective fall prevention. There are plenty of other systems out there that do eliminate the need to work at height so in my opinion would be a better investment.
I was with Rick on Tuesday discussing this and we both agreed 80% of our clients have adopted the step. My personal feelings is ownership and cost is the reason.
Maybe the B Safe is an option or the push along horizontal rail that everyone has forgotten about, you already own that.
Next the issues regarding steps and HSE Riddor information, the HSE sits on the SG4 working party and they are aware of injuries and incidents regarding ladders and i am sure if they thought it was a problem they would have addressed it. Again they are one of numerous methods of erecting safely. A book by the NASC has to be impartial showing all options, if you have a problem with the step consult your employer and explain the other products on offer and write to the NASC and HSE with your concerns. All the letters received are read out and answered.
As with SG4 its not written in a dark room and just brought out on the day, it has to go through the health and safety committee, the officers, the HSE and all of the membership at the September regional meetings. In October representatives of the SCCR/Scaffolders forum had a briefing.
The step is not collective protection, the handrail is when you are stood on it and you are clipped on. As for scaffolders knees and long term ailments i would say it was too early to say what it can do. If its measured and reported correctly then it may be removed from the next revision however evidence will be needed to support this.
Lastly i am a scaffolder and i have been through the days of wearing a harness will make me sterile and damage my circulation, wearing safety glasses will damage my eyes. I would advise any of my clients to go and have a benchmark medical prior to working with the step and have another in 4 years to check for deteriation otherwise we will go round in circles for years.
Ian