At the end of the day it boils down to the consumer opting for an accredited Sparky with a good reputation rather than the cheapest he can find. Protection is required by the regulations. I have turned down a lot of rewires requested purely because of the age of the installation. Insulation readings are better on some old installations than on a new roll of T&E. I sleep like a log because I know my work has made someone's home safer for their kids.