Just curious. The U.K. went to metric cable in 1970, and at the same time the IEE Wiring Regs. changed all measurements to metric, which resulted in some minor changes to allowable distances due to rounding, e.g. 6 ft. became 2 m.
Prior to that our cables were sized by strands and diameter, e.g. 7/.029 = 7 strands each 0.029" diameter.
