My consumer unit needs changing as I have one of the old fuse types with only 4 fuses. 1 for my shower, 1 for both rings upstairs and down and 1 each for the lighting circuits. I have also noticed that my main fuse is marked as 60/80A. Could I get the leccy board to come around and change this for a 100A fuse and will they leave the old one out while I change the consumer unit? also will they charge me?