The case involves a situation where QQ, a company, suffered damages due to the negligence of RSL and DHS. The damage was caused by the installation of a heating system that did not work properly, resulting in an explosion that injured employees. Under English contract law, QQ can claim for compensation for expenses incurred in complying with contractual terms, as well as damages due to fraudulent misrepresentation. Additionally, under tort law, employees Sally and Sean can claim for compensation for their injuries, as both companies breached their duty of care. Furthermore, Amy, another employee, can also claim for compensation under tort law as RSL failed to provide a safe surface on the stairs. Overall, all four parties are advised to sue the companies for damages.