[Si Coe]

Truth be told, it doesn't matter if you do or don't have to follow the guidelines from the BRCA's standpoint - from a H&S point of view, once guidelines exist for demonstrated 'safe practice' you need a bloody good reason for not using them.
Case to point are the number of cyclist injured by car claims that get thrown out because the cyclist wasn't wearing a helmet. Its not the law, you don't have to, but its accepted as good practice and failure to do so is seen as not taking adequate precautions.
If somebody does get hurt by a bursting lipo - the first question will be was it in a sack? Not would a sack have prevented this in the first place, just that it wasn't in one.