I think we should all be grateful that we have such a wonderful fire service. Without their skill, dedication and determination to gather all the evidence they did, Cctv witness statements, etc a very nasty individual would never have been brought to justice. Such was the wealth of evidence gathered by the fire service the killer had no choice but to plead guilty at the first opportunity.
Imagine if it had been left to the corrupt, misogynistic, masonic, racist, incompetent Metropolitan police. He would still be free to kill again.
We are so lucky.