Bad advice and no defence.
So the advice still comes down to whether it would be offensive to a bitter old woman who's judgement is so poor she sees nothing wrong with roughing up opposition MPs with anti-terror police, and an angry grieving mother who clings to the belief that murderous tendencies must be the fault of pornography rather than sick individuals.
Oh, clause 21 means my defence is void, as I'm the author of a disc repair tool, which has the limited ability to recover to deleted data. So if I ever get any extreme porn spam, I have to wipe my hard disc. I better go an add a safe delete feature.