My home is technically one flat of 5 in a converted house. Most of it is a single storey rear extension and it has its own front door and independent access down the side of the main house. My meter and a 60A switch-fuse are in the common hallway that serves the other 4 flats from this a 16mm feed runs under the floor of the other gf flat and my bedroom to the CU in my hall. To date this has presented no problems as we have let out other flats so I have always had access to the front hall.
We are now selling off the flats and the lease that formalises my occupancy will not allow access to the common parts as there is no reason to go there, electric meter apart. So what I need is a meter (presumably external) by my front door feeding back into my CU.
The question is whether the board would allow a submain from the existing 2-phase (remnant of DC days) intake more or less following the line of my existing 16mm cable or would they insist on a new cable being brought in from the road. If the former what sort of cable would be involved: ?? 25 armoured about 25mm dia or what ???