What is the problem and where is it?
I don't want to take away from the horror of child porn but it appears to be a much smaller problem than the sexualisation of children generally. If the 20% "sexting" is the indicator being used and we assume that children being involved with sex is a bad thing (as the paedophilia/child porn laws and the prosecutions indicate) then something much bigger is going wrong somewhere.
A society which celebrates, promotes, and pushes sexual activity so explicitly, publicly, frequently and so forcefully even at children (I'm looking at you, advertisers, MTV et al.) can't really expect the switch to be set to "off" until a child hits the arbitrary age of 18. You can forget peer pressure from friends when the whole culture - tv (especially soaps), films, music, billboards and fashion are all telling them sex is the ultimate experience and everyone is doing it.
If adults don't conduct themselves with modesty, what makes anyone think kids will?
Until people start evaluating what goes on in society and then do something about the things which are inappropriate, nothing will change. You don't need Daily Mail "think of the children" legislation or organised boycotts. Just don't consume from inappropriate advertisers, media channels or retailers and let them know why.
The prosecutions are ridiculous - its all just PR for the business that is government, so don't consume what they have to offer. Write and tell them you are offended at their crass attempts at advertising/manipulation and won't be voting for them in future.
Don't get me wrong - I'm all in favour of sex - just not in front of the children!