Excerpt:
Hate preacher Abu Hamza is delivering extremist sermons to prisoners through the water pipes of his cell, it has been claimed.
The Muslim cleric is defying a preaching ban imposed by prison bosses to radicalise inmates.
He is able to give his lectures through the plumbing that connects to neighbouring cells in Belmarsh Prison.
The Quilliam Foundation, a counter-extremism think-tank, has called for the 51-year-old to be removed from the mainstream prison population.