Are they not when they apply to some actual goods being sold?
e.g. even if it is not mandatory to supply an item of equipment with a "13A 3-pin fused plug" attached, if you do aren't you obliged to supply a plug which complies with BS 1363?
The Approved Documents are not the Building Regulations, a fact which is not changed no matter how many ignorant people consider that they are.
This cuts right to the heart of the rottenness that afflicts the plumbing forum - as soon as you start lying to people because you cannot be bothered to explain things properly to them you risk devaluing every other single piece of advice you give.
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