Its in the Midlands area, and to be fair they are pretty good. However looking through my copy of sg29:08 (internal edge protection on scaffold platforms) A thrilling read ! there is no mention of the 300mm rule. However somebody is bound to tell me "You need to look at sg29:13, it packed full of the latest legislations including the 300mm rule" I can hardly contain myself in anticipation......Have you got contact details for "the reputable CISRS training centre"?
Is it the one in the North East?