Ideas please, we have had an accident on a standing seam roof, a slip. The roof has a slight pitch, workers were walking on the seam, carrying materials! Apart from constructing a tied scaffolding board platform across it, are there any other solutions out there; and has anyone else experienced issues for workers (window fitters /scaffolders/welders/ heating engineers/solar PV engineers, etc.)?

Lloydy - how do you define a "slight pitch"? In past UK construction health and safety legislation any roof with a pitch of up to ten degrees fell within the classification of being supposedly flat. 

Designers don't design flat flat rooves as water would pool. So even flat roofs are designed with a slight pitch to enable water to fall to the drainage provided.