Maybe to avoid confusing myself more I must ask this differently....A guy plans on moving and asks you for a COC. the house was built in 1980, but he has installed a lot of stuff a week ago (himself). There is no Earth leakage. Do you give him a COC, or do you say sorry sir, but I need to add an Earth Leakage because thats the law and you have altered your installation making it post October 1992.