Hi loopylou:
You've made a couple of vague and unsubstantiated statements yourself, if you don't mind me saying?
Without knowing anything about your allegations, I don't really know what you expect any of us to say?
The only certain thing which I would comment on is the fact that plea bargaining which you refer to in your mention of the S18/20 offences is an extremely common practice between prosecution and defence representatives and there are numerous reasons why it happens.
The second fact is that the CPS uses the public purse with which to bring prosecutions and, again, there are many factors to be taken into consideration by the CPS in order to bring justifiable actions to Court and at the same time, in a nutshell, giving best "value for money."