Re: Are there 'other' IWFs?
Yes they are UK based.
They are a charity so there is no government or official oversight over what they say should be banned. There is no need for them to disclose any backers, funders or political ideology. There is no reason for an ISP to use their list other than a Daily Mail backlash if they don't.
You could just as easily decide that Greenpeace, or CND, or the Socialist Workers Party should publish a list and you should use that.
Other countries have their own groups of citizens concerned about the children. Some of these groups also don't like gays, or abortion, or breastfeeding - you have no way of knowing what their agenda is because the lists are secret.