I am going to be getting a new kitchen but when I went to B & Q for the quote they told me the electrics in my kitchen would need re-wiring. They also mentioned I need a new fuse box and a RCD. Is that correct that I would need both a new fuse box and a RCD? Also around about how much should this short of work cost? (4 double sockets, 1 cooker switch, 1 light switch)