Paragraph 4 Stability of working platform

be suitable and of sufficient strength and rigidity for the purpose or purposes for which it is intended to be used or is being used; and

be so erected and used as to ensure, so far as is reasonably practicable, that it does not become accidentally displaced so as to endanger any person; and

when altered or modified, be so altered or modified as to ensure that it remains stable; and

be dismantled in such a way as to prevent accidental displacement.