I have to comment on David and Trumpy:
The radial circuit doesn't need two cables at each socket. In fact, this may be frown upon by some constructors. In modern offices, flexibility is very important. The higher rent per area unit compared to older offices is compensated for by more efficient use of the area. (Or at least they try to)
This means that walls come up and go down as the company reorganises. Only the ceiling, floor and structural walls (don't know what to call the walls you can't remove) remain fixed. Obviously, cables run from socket to socket aren't suitable in removable walls.
Ok, you could do a ring in the ceiling and spur down, but a radial layout seems simpler.
