All kidding aside mate, looking at the pics (Who.s a clever wee laddie then) there is additional new works been added, Extractor flue, new downcomers, and those joists look a bit beefy.Who and how were these jobs done ?
As one post mentioned earlier, could you not put a Vertical shore underneath, put a Mat on the roof then get a few Anchors and Ties in, to spread the impact load, instead of just relying on the One case scenario of dont stand on the roof it is going to break !!!!!!!!!!!!
check the details in the legend on that loading bay grwg i sent you his name and numbers on there he can do it via your pics and drwgs instead of site visits average turnaround about 2 weeks - paddys got the best option -when all else is said and done do em all lolo
I use Rolf Harris, "Can you tell what it is yet" ?