That's the last of the big four in the UK having initiated this filtering. New customers will have this turned on automatically, but by the end of 2014 we should have a better idea of the total impact of the filtering.
Virgin Media has turned on a filtering system to help parents stop children seeing inappropriate material online.
The firm is the last of the UK's big four ISPs to turn on the government-mandated filtering system.
Initially only new subscribers will be asked whether they want the filters turned on or off.
TalkTalk Business are also implementing this. I was prompted to a check box when I logged in to pay my last invoice. I guess they are testing this with business customers first to block NSFW content, before rolling it out to home users.