The UK does not, but Sweden has violated said treaties. Here is an article on the subject, where several men were extradited from Sweden at the USA's behest, to Egypt where they were tortured: http://www.hrw.org/news/2006/11/09/sweden-violated-torture-b...

As the UN panel notes this is in violation of the very treaty you cite. This is precisely the fear and it is clear the fear is reasonable and well founded in fact. The UN findings are unequivocal.

It would have to violate both Swedish law (which expressly forbids extradition if the person is to face the death penalty) and European law.

If they're willing to go that far I really don't know why they don't just let him go to Equador and have him assassinated there, it would be a whole load easier.

Those people were not extradited. If you want to talk about illegal renderings then the UK is much more complicit in those than Sweden and it makes no sense that he would be safer in the UK than in Sweden.