This is a long standing conversation, where we'd professional say no. A piece of government guidance literature has been circulating for quite some time, and is quite outdated. Don't forget, government guidance is only guidance. We'd look to the world class standard for Fire Detection and Fire Alarms, BS5839, and BS5839 clearly states, almost all properties should be looking at having D1 LD2 systems installed as a minimum. Why would anyone want to try and bypass minimum safety standards?