I didn't know about this and it's quite interesting. But I wonder why it no longer exists this way? Is there a reason why a "for-profit" discontinued a service like this?
EDIT: Seems I found a clue ....
"In 1862 insurance companies told the government that they were unwilling to be responsible for London’s fire protection as the cost of compensation was becoming too high. The government decided that the Metropolitan Board of Works would take control."