Just wanted to let people know that after the advice on this thread i got in contact with Thorn and actually did an interview with Robin Thorn, the head honcho over there. Was very informative and gave some great advice about his bikes and touring in general. It's only ten minutes long but gives you a bit of an insight into the thinking that goes into the Thorn product. He is a nice guy who obviously knows and loves his business.
here is the link.
cycleforchange.wordpress.com
Hope you enjoy.