What Swedish judicial system can do in some cases, see: http://www.dn.se/nyheter/sverige/sve...s-for-folkmord [translated news here]
Swedish citizen charged with genocide
"It is easier to gather information in Rwanda, and it is unique, I think that a Swedish court is willing to travel to another country to conduct a trial, says Magnus Elving the echo."
Regarding not it is possible to go to the UK to do an interrogation.
Note that the court can move.
Original Flashback: https://www.flashback.org/sp39512906
Original link for case: http://www.dn.se/nyheter/sverige/svensk-medborgare-atalas-for-folkmord
Translated link of case: http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fwww.dn.se%2Fnyheter%2Fsverige%2Fsvensk-medborgare-atalas-for-folkmord