The Blue Lagoon near Buxton, a flooded quarry - has inviting turquoise waters, but it is so polluted it's almost as toxic as bleach.
There are warning signs saying it can cause skin and eye irritations and stomach problems, but families and young swimmers are ignoring them.
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A largely cloud afternoon with some patchy rain for some. Winds will also increase through the afternoon.
A motorway policeman came to the unusual rescue of a newborn and his mum yesterday after a dramatic arrival on the hard shoulder of the M42.