There are advantages to working a 24 hour economy, for businesses, employers and customers. The pp above who talked about the advantages of making full use of expensive manufacturing machinery in a competitive global economy had a good point.
By comparison there was no comparable advantage in letting the many people who wanted to smoke fags in their local pub or work at heights without doing all their harnesses up carry on doing those things. So we're not going to get a full legal ban.
But I think we need to take into account the health damage done to shift workers. I don't think people are necessarily going into it with their eyes open to the risk making an informed free choice. And I don't think employers are recompensing them or acknowledging the risks - and I were their EL insurer I'd be advising them to watch their backs and follow the HSE guidelines to the letter.