This is a big worry. It obviously needs to be rectified before the widnes game, but the contractors wont be allowed up there whist the winds are still as bad. Also, how do incidents like this affect the ground safety certificate??
Looks like a specification issue to me - the structural engineer/designer has specified a roof lining that should be able to stand the wind loading, only to find in the cold hard light of day that it cant. The trouble is, the cantilevers that hold the roof structure will have been designed to carry the loading that the current materials provide. If you now have to go for something more substantial, it will be heavier and the steelwork may not be designed to carry it. Most dead loading will have a 60% factor of safety, which may be upped as its a roof that could at some stage be covered with snow. That may be sufficient to enable them to reinstall a new roof lining that is more substantial, but only the Structural Engineer would know that. I think Saints will have no option but to make a statement on this pretty soon.