Hello I am a solicitor with over 15 years experience. I will try to help you with this.
Here is an extract from the code for Crown Prosecutors which I think answers your question.
Generally, an offence will only be triable in the jurisdiction in which the offence takes place, unless there is a specific provision to ground jurisdiction, for instance where specific statutes enable the UK to exercise extra-territorial jurisdiction:
Rape pf an adult is not on that list and therefore cannot be tried in the UK if committed abroad.
Is a 16 year old deemed an adult?
Are you there?
yes I am here. I will need to check hat when I get a chance later today. My initial reaction is that a 16 year old is a child in this context but I will check that later today. I have to do something for the next couple of hours but will get back to you as soon as I can
Okay, to clarify the situation - my daughter was raped by a 16/17 year old boy whilst on holiday in Turkey (I have his full name and home address). Both are of British nationality and live in UK. My daughter, accompanied by the British consular, made a statement to the Public Prosecutor and undergone a medical examination. The other party returned home before the police could effect an arrest. For logistical reasons we would prefer the case pursued in UK court.
Can this be done?