From what ugly has told us I don’t think ".....you were otherwise maliciously or wrongly prosecuted...." will fit the bill, tambourine.
The CPS must ensure there is sufficient reliable evidence to support the strong likelihood of a conviction. He has already been charged so that test must have already been made. If there was any hint that the prosecution was malicious or wrong it is unlikely to have been authorised. This seems to be a classic case for a Bench of Magistrates to deal with - two different versions of events, one (or possibly both) being some way from the truth. Most prosecutions for violent offences take that form.
It is for the court to evaluate that evidence further and the fact that he will not be represented does not mean he will not receive a fair trial. The prosecution still has to bring evidence to the court to support a conviction “beyond reasonable doubt” and he will have the opportunity to refute the allegations made. There is nothing unfair about that.
I'm dipping out now because the thread is degenerating into a slanging match, which is not very helpful, especially for ugly.