Good morning guys, So I am doing a DYI project with my kitchen, and as part of that I want to replace my existing sockets and spurs with new ones. However I have a few questions before I do it so as not to damage anything. Do I have to earth the back boxes as well as put the earth wire in the face plates of the sockets? ( the plates are all plastic ones ). What about plastic back boxes for dry wall? Do I just run the earth cable into the face plate which is also plastic? Also, the spurs. How do I know which wire goes where as in where does the appliance go and where does the main electricity wire go?