Re: The filtering isn't my main issue
At the risk of being pedantic they seem to say is that no inspection of the traffic is done for those with the filtering switched on, not that they can't tell who has it switched on or off (they would need to know this otherwise how would they know that the connection needs to be filtered?)
From the BT blog entry:
We also conducted user testing and product refinements throughout our trial phases – including testing with Mumsnet.
Oh goody. </sarcasm>
Also:
We make it clear to users of BT Parental Controls that BT is not responsible for any of the site categorisations as these are done by our third party specialist vendor.
Genuine question: if an NHS trust can be held liable for a sub contractor not properly destroying hard drives - and thus be held accountable for the actions of a 3rd party - then surely BT can be held accountable for the actions of whatever 3rd party it is that they're referring to in this response?