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Chief safety officer Dr Alison Cave said the body's criminal enforcement unit "works hard to identify those involved in the illegal trade in medicines".

He repeatedly pretended in texts to his victim's mother, Alison Spencer, that her daughter was "alive and well".

After Samantha Madgin was murdered in Tyne and Wear in 2007, her sister Carly Barrett and mother Alison Magdin set up Samantha's Legacy to educate young people about the dangers of carrying knives.

However, Alison Downes, director of pressure group Stop Sizewell C, said ministers had not "come clean" about Sizewell C's cost, because "negotiations with private investors are incomplete".

However, Alison Downes, director of pressure group Stop Sizewell C, condemned the announcement, adding it was a move the government would "come to regret".