I wish to replace my old CU (see photo in my profile) with a split load RCD protected one. An electrician gave me a quote which seems high and I am considering doing the work myself. I called the supplier (EDF) who said that they do not fit isolator switches (as suggested on other threads - yes I have done a bit of research ). All they will do is temporarily suspend our supply. The catch is that in order to switch it back on, they want a certificate which I cannot supply if I do the work myself. Doing the work "live" is out of the question. What do you suggest? Thanks.