Part of this was calling on the Office for Product Safety and Standards (OPSS) to review its practices relating to safety warnings on similar flueless heaters. "The 1995 Regulations and the voluntary standard for dedicated liquefied petroleum gas appliances are not prescriptive about the location of warnings. The chief executive also said he will contact the National Residential Landlords Association to understand its guidance to members, and the Health and Safety Executive has also been contacted to consider its position on landlord responsibility for gas safety. “We think the other thing is, people aren’t really aware of the dangers of carbon monoxide. “From our point of view, we wouldn’t have been aware of the danger of carbon monoxide ourselves before Tom’s death.