@BT Bunch of Tossers
As a former employee, I have to take issue with what you're saying about PN. When they were bought by BT, nothing much changed. A few faces at the top, that's about it. They most certainly did not, however, turn "into a bunch of muppets". If anything, the drive and focus increased in the post BT buyout days. I can honestly say I've never worked alongside such a dedicated and talented bunch of people in my life, and I don't expect I ever will again.
You clearly don't know much about your history, as Force9 WAS Plusnet - not bought by Plusnet. F9 was their first brand.
As for the problem in question, it appears to me (from reading the community site, specifically the forum post where the customer posted their issue) it would appear that it's a BT screwup, not a PN one. From what I know about the BT Webwise trial (which is only what I've read in the tech-press, not from when I worked at PN), BT configure their network devices to intercept certain segments of customers going through their network. Other segments are configured to bypass the Phorm kit. My assumption would be that BT, instead of excluding this customer and configuring the bypass, configured her for the Phorm trial. Their bad, and they fixed it. I wouldn't go as far as to say any traffic going through BT Retail is fair game for snooping, but I would concede that they do appear to be using the BT Retail network for the trial. Which of course makes sense - it's their network.
And to the Comms guys who will doubtless be reading this comment - hey guys, hows it goin :D