My brother bought his house off the council of the council about 3 years ago and I am giving him a hand with the refurbishments .With regards the electrics we will get an electrician to replace the old rewireable board with split MCB/RCD cosumer unit.We have found that the old red& black T&E to sockets looks in good nick but the steel back boxes were not earthed but we have now done this.With the 2 lighting circuits which are wired in single cables there are no earths at lights or switches.Would it be OK to run single 1.5 earth cable to switches and lights and leave 2 tails by fuse board so that when we get a sparky he can test the earth loops and connect to the consumer unit he will fit?. Thanks in anticipation . Wes