Dedworth.
I don't what happened in your case but from what you said, it might have been that but for the errors, which might well have been typing errors by the civilian staff who prepared the court papers and not errors by the police officer as you say, you would may well have been convicted of the offence. So maybe you were lucky that the errors, wherever they were made, existed.
When police prosecute almost anyone, that person will always argue that they were innocent and the police got it wrong. I remember being in hospital as a teenager and two guys in the same ward had collided with each other when both were driving motorcycles around a bend in opposite directions. Both claimed it was the other who was at fault and not them.
Its a Funny old life !