Mr Abdel Basset Ali al-Megrahi and Mr al-Amin Khalifa Fhimah are to be tried for the Lockerbie bombing at the disused military base of Camp Zeist, which becomes British soil for the duration of the trial, under Scots law.
The Dutch legal system initially assumes responsibility. The suspects have been arrested and detained until extradition procedures to Camp Zeit are completed.
Under the normal procedure, which generally takes three to four months, a court will hear the extradition request. But the suspects last night opted to simply agree to extradition. In this case, extradition formalities will almost certainly be completed by this morning.
The Scots legal system now takes over and the suspects are transferred to Camp Zeist. Within 48 hours of their arrest by Scottish police, the accused will appear before a sheriff, or regional judge for "judicial examination". They will then be automatically committed for trial.
An indictment must be served within 80 days of committal for trial and the trial must begin within 110 days, unless the court grants an extension.
At trial, there are no opening speeches. The Crown must prove its case to a high criminal standard, or "beyond reasonable doubt".
After presentation of evidence, the Crown and defence address the court. As there is no jury in the Lockerbie case, the addresses will be made to the three judges.
There are three possible verdicts: guilty, not guilty or not proven. Not proven, like not guilty is an acquittal, meaning the accused person cannot be tried again.
The Crown can appeal a not proven or not guilty verdict on a legal point. The defence can appeal a guilty verdict and the Crown can appeal length of sentence. The High Court, sitting as an appeal court, may well convene in Edinburgh rather than The Hague.
If found guilty, the accused will serve their sentence in a Scottish jail.