It's quite possible that it didn't update the plug configuration, but rather improved the actual design of the body of the plug itself.
Older (pre WWII) UK plugs sometimes had screw on backs, didn't necessarily have proper cord grips etc.
The older sockets also had terminals which were very close to the surface of the wall plate itself and could potentially be contacted quite easily by children etc.
While many of the manufacturers, e.g. MK, had already adopted much higher standards, I suspect the official standard didn't necessarily specify them until BS546 was introduced.
I'd say somehow it was a 'tidy up' of the existing standard rather than one that actually radically changed the specification of the plug/socket system.
I'd say the only way of checking would be to find some historical technical archive as BS546 is around quite a long time now.
Last edited by djk; 06/27/07 03:25 AM.
