This should not cause problems for public water companies, which already have monitoring and treatment processes to deal with any organisms or chemicals in their supplies.

BBC: Pyre health risk warning

At Cardiff University Dr Emyr Lloyd-Evans has been given funding by children's charity Action Medical Research to unlock the secrets of Smith-Lemli-Opitz syndrome by investigating the processes that cause it and analysing two possible new treatments and how they might work.

BBC: 'No-one had heard of my boys' syndrome'