I've been blocking talktalk's "virus" bot for some time now, pretty much since it first hit. And the US china-owned server farm that tests/tested their system.
The fun thing is: the bot tests your web page AFTER you have it displayed on your screen (unless they have recently changed this). So what point to it? Unless some other mug using talktalk hits the same web page within their cache period it's pointless. Plus, since we know their bot signature AND IP range, it's easy to serve up any content we like. :)
Obviously, it's a prelude to targetted advertising.
Oh - and a way of letting china know what mugs in the UK are looking for!
An item in a UK newspaper today says parental control is not possible using this service.
And, of course, it is completely illegal to intercept transactions in this way in the UK, even though BT were let off for a similar offence (phorm).