They wanted to see justice done and believed the Crown Prosecution Service reached its decision wrongly.
Brian Douglas, a 33-year-old music promoter, was arrested last May. His family claimed he suffered a fractured skull caused by the use of American- style batons.
After the CPS announced last week it would not be taking action, Mr Douglas's brother Donald said the family would be starting an appeal to raise money to bring a private prosecution.
But yesterday Donald Douglas said the family would initially pursue the matter through a judicial review. "We hope to bring this matter to the High Court within the next 10 days. If that fails then we will set the private prosecution in motion," said Mr Douglas at the family home at Balham, south London.Reuse content