I have asked an electrician to fit a new consumer unit for me. The current one is the original from when the house was built around 50 years ago. He is local and knows the wiring in these houses. He has told me over the phone what he is going to do which is to fit the new unit in a slightly different location as it is much larger than the original. My only concern is that there is no extra length on the wiring going into the current unit. Will he be able splice in extra cable to reach the new unit? What do the current regs say about in line joints?