I must admit I am tempted to repair the existing pyro to save all the bother of laying new cable plus the expense. At the moment the pyro goes throught the metal conduit, reaches the house where it goes up the wall to just above the dpc and terminates in a round conduit junction box on the outside wall. At that point it is connected to the old CU with 2.5mm T&E. Thing is that the conduit box isn't weatherproof and I'm sure would let in damp leading to tripping of the RCD, when moved to the new CU. I guess I would need to replace that with a proper weatherproof junction box, but would need to make sure I could find one to terminate the earth properly with.
If you see what I mean
!
JD
If you see what I mean
JD