Peter N

Even with a 10% take up amongst the big three ISPs, you're still looking at 1,700,000 people. If Phorm pay the ISP's £1 per opted-in customer per week you are still looking at £88,400,000 per year.

That's a lot of money for basically allowing Phorm to do all of the work - they don't even have to pay for the equipment.

In order to reduce the ISP's income by the same amount of money you'd need to persuade over 5,000,000 customers to move to a none Phorm using ISP - assuming that there are any left.