BS 5733 specifies requirements and tests to check the safety in normal use of electrical accessories which are not covered by other specific British Standards
Well, ring my chimes. A catch-all clause that covers anything that might have been forgotten by all the other standards.
I presume BS 5733 is used for basic, mega-simple stuff like cables and junction boxes that damn well shouldn't go wrong unless somebody's made a serious manufacturing cock-up? I suppose, though, that it could stop ultra-cheap gear from the dodgiest cheapskate locations from getting put into decent gear?
Would be interested to know what else BS 5733 applies to?