i have a friend who has just moved into a councill property and needs a shower installing, the ccu only has 3 fuses,lights, sockets, and cooker. i have been told to buy a shower consumer unit and a 6W 100A DP Service Connector Block , can anyone tell me the way to incorporate the shower unit via tails etc. at the moment the main tails go from main intake into the meter and then out into the ccu .thanks.