What was that film called about that poisoner who killed his mum?!

What was that film called about that poisoner who killed his mum?

It was a film of a true story, came out about 15 years ago, British film. The bloke worked in a chemical lab and became obsessed with poisons and their effect on the body.

2 weeks ago
thanks, lifesavers, it would have kept me up all night. Theres a documentary/drama on ITV3 now about him and it was really annoying me

It was called "The Young Poisoner's Handbook"