If he wanted to be tried under the English legal system, he should have bumped her off in Margate (allegedly, of course).
I couldn't watch the programme, obviously, but I guess the point was made that there are no jury trials over here. Judges only. Probably a throw back to the old apartheid days when there weren't enough white people in the country to fill the benches. But there is a pretty robust appeal process, and you don't seem to get many miscarriages nowadays.