John Wyn Williams

Call 1992

"Noted for his expertise in environmental cases of waste, water and air pollution."

The Legal 500 2018/19
Photo of John Wyn Williams

Practice Overview

John is a senior regulatory barrister. He has acted for a number of companies and Local Authorities dealing with a wide range of regulatory issues. His practice includes a number of high profile environment prosecutions, and he has acted for the Environment Agency and companies in air pollution and waste cases. He has an in-depth knowledge of water pollution cases.

John is also a senior criminal practitioner who defends and prosecutes serious matters in the Crown Court. He has defended and prosecuted homicide and serious rape cases and has a wealth of experience in dealing with complex historical sexual allegations. He is particularly expert at dealing with children and vulnerable adults. He is on the CPS Specialist Rape Panel.

He has defended and prosecuted serious and complex drug conspiracies and is adept at dealing with telecoms and cell-site analysis. He led for the prosecution in a recent case dealing with firearms shootings between rival gangs in Merseyside. Analysis of complex DNA evidence and statistical evidence presented by Professor Balding led to the convictions of four members of the gang for possessing a sub-machine gun and discharging a Colt .45 with intent to endanger life.