Facts are different to accusations and prosecutions, the fact that no benefit in monetary terms was gained by the bowling of the no balls in the UK means that no criminal charges can be brought. So it makes no odds if they bowled them on purpose or not in the eyes of the law, so the fact that the police will not be taking action does not prove the players innocence.
As for the stupid counter claim of the fix being recorded the day after the police and ICC were sent full transcripts of the video before the start of the days play. The balls were bowled as per the recording and the ICC has the proof of this.
It is also well known that gambling is not legal in Pakistan yet it goes on, the sting on the illegal bookies will not be reported and so proof of this is not likely to be given to the authorities by those breaking the law.
Long term problems resulting from sub continent gambling has been around for quite some time, coupled with the odd results recorded by Pakistan and previous accusations and prosecutions of players and former players have been long known and allowed to be swept under the carpet. Do we expect anything more than another round of this now? I think not, judge the future by the actions of the past.