It's not uncommon to find the service entrance conductors run a long way like this in British houses.
The typical setup has the overhead drop terminated on a bracket at eaves level, then the cables run along the outside wall to the point where they go through to the inside metering equipment. But in some cases the cables are taken into the attic and then dropped down the the meter panel.
A couple of places I've worked locally have the cupboard with meter and panel located pretty much in the middle of the house, and those service cables run about 25 ft. through the attic.
They are just PVC-insulated cables, no conduit, and with only the main pole-mounted fuses on the local 240/415V wye network for protection.
