My thought was that if the ventilation was 'required', then the person using the bathroom ought not to have the option to not to use it.
Perhaps "required to be available" would be a better way of describing it?
Sure, but my understanding was that the requirement for electrical ventilation usually only arises in situations in which there is no natural light - hence, linking the extractor to the fan to tyhe light is a pretty sure way of making sure that it is operational whenever the room is occupied (and for the run-on period thereafter).
Well, you could have a bathroom provided with natural light by some means but which doesn't have an openable window for ventilation. Granted it's probably unusual, but it's possible.
It also appears that a new version of the Part F Approved Document was published last October, and while I haven't read through all of the relevant sections yet, I think I did notice something in the new dwellings section about providing mechanical ventilation in
all bathrooms now (not that anything in the Approved Document is mandatory, of course).
But my view is that the now-common practice of linking the fan to the light switch is generally not a particularly good idea whatever the situation. For an internal bathroom with no natural light, the fan will run unnecessarily when somebody pops in quickly for a minute during the night. If the fan is set to run on for 15 minutes, that's particularly annoying. For a bathroom with a window, the same thing will happen during the hours of darkness, plus you have the situation where if you then want to run the fan during the day, you have to switch the light on as well even though you don't need it. I want an exhaust van in my bathroom, but I would always have it wired to its own switch so I can turn it on when, and only when, I want it to run, and completely independently of any lighting.
However, if the OP doesn't mind his house being damp and smelly (although not that bad, really) what has it to do with the government?
Precisely - Things like this are none of the government's business.