Britain was involved in the hunt, trial and conviction of Radovan Karadzic. And now it is taking responsibility for enforcing the sentence handed down to him.
British intelligence played a role in his capture in Belgrade in 2008 after 13 years on the run. British judges and lawyers were involved in the trial against him at a United Nations tribunal that the UK helped to set up.
One of the young lawyers who drafted the legal procedure to transfer Karadzic to the UK was a certain Dominic Raab, who is now the Foreign Secretary - and who ultimately agreed to the request from the UN that the former Bosnian Serb leader should serve out his term in a British jail.
Officials say the reason the UK agreed is because it is on the list of UN members willing to detain those found guilty of global crimes, and it wished to show its continued support for the international rules-based order.
The UK will bear the costs of Karadzic's detention but any decision about whether he is released before his death would be a matter for the UN authorities in The Hague.