Tuesday, 15 December 2020, 3:50 pm A gas explosion in Christchurch which left six people seriously injured and several properties uninhabitable serves as a warning to all gasfitters, says WorkSafe. All work with gas must be done by the book - because when things go wrong, the consequences can be grave. In July 2019, certifying gasfitter Gregory John Smith was repairing a fireplace at a home in Christchurch. As part of the repairs he removed a gas valve, which is used to control the flow of gas. He advised he would return the next day to complete the repairs. “However, Smith had not disconnected the gas supply to the heater (by