Please, MNHQ, do have a read of this thread and consult your Tech people so they can give you the answers as to whether your support for this campaign and the Minister's plans are worth going on with.
I would hope you not only reverse your position but assuming you get sufficient technical reasoning in 'Plain English', that you go public and explain how unworkable the proposal is likely to be. I feel sure journalists at Computer Weekly and Computing will be able to provide confirmation that filtering is a hiding to nothing and can be very costly because of the millions of GB of data flowing through the bigger ISP networks.
For anyone baffled, and wondering if I'm a nut case, this concerns a proposal to get ISPs to "filter out" all porn, unless a customer "opts in". For numerous technical reasons the idea is never likely to achieve filtering without blocking access to legitimate sites or not blocking access to better than say 95% reliable, thus making it a costly exercise in futility, while parental vigilance and filtering software at the home would still be essential for peace of mind.
(Incidentally the wording of the campaign page implies the parents need to ask, at the same time as someone wanting not to have censored content needs to ask - it is one or other, but not both that would need to contact ISP. )