The fundamental thing is that it has not been established that rape took place. She reported a rape so a case was opened. She retracted the allegation so a different case was opened. There was never any guarantee that the first case would be proven, had it run its course. Either way, either case, the lady was going to be involved in court proceedings, with an unknown outcome. Rape cases are notoriously difficult to deal with and the important thing is not to give rise to a difference in weighting between guilt and innocence of either party, rapist (done the deed) or accuser (lied). A simple but wholly wrong approach would be to assume every allegation must be truthful until proven a lie. As it is the accused is assumed innocent until rape is proved - what constitutes the absolute minimum requirement for proof of rape having taken place where the accuser has willingly entered a private/exclusive location with only the accused present when the event is supposed to have taken place ? Actually, the accuser very often cannot prove the accused's guilt and even more often than that the accused cannot/could not prove (his) innocence.
Which country all this took place in is not the principal issue, nor is the fact that the lady is British. If either were major considerations then UK court decisions where foreigners are involved should come under scrutiny as to whether they are cause for "boycotting" the UK or parts of it. There is not a country on the planet where court goings on are beyond reproach.