Comment Re: Update the constitution (Score 1) 426
Double jeopardy has been limited, in that there are now fairly limited grounds on which a re-trial can happen. It only applies for certain "serious crimes" and only with the consent of the DPP, and after the Court of Appeal has quashed the original aquittal due to the existence of "new and compelling evidence". More details here.
As someone who's had to try to find this sort of "new and compelling evidence" in a criminal case (although the other way around - seeking to quash a conviction, rather than an acquittal), it's quite hard to do...