The other change, which happened at roughly the same time, was metrication of the old imperial system of weights and measures. This idea dated to before Heath, and was continued after him by the next Labour government. It was never fully completed. Speed limits are still in miles per hour, and measurements of length are still in traditional yards, feet and inches, with metric as an alternative. Once again, the changes were hugely expensive. It meant an almost complete retooling in the machine tool industry.