My names are x and I have a pending court case due to take place on x July 2010. The particulars of the charge are "Failing to comply with red traffic signal". Two Police men have both given evidence against me in this regard. However as far as am concerned I did not fail to comply and by the time I drove through the signal was on amber.

I had a passenger in the vehicle and as soon I sighted him as my witness to my version of the event one of the Policeman went to  and told him to get other means home because I was going to be arrested for being drunk and abusive of course which was not true because  I have never tested alcohol all my life and as a matter of fact I was not arrested nor did  both policemen mention this in their statement.He(my passenger) straight away jumped in a black cab(London Taxi) and the following  day he rang my  office to express his anger about me.

The question is,  should I plead guilty due to the fact that my witness was turned against me and that its my word against that of the two Policemen or not guilty because the tactic used by the police to deter my witness.