maybe the guys guilty, not sure.
but it looks like his defense is that he subscribed to, perhaps an adult site using the same payment processor, - and a webmaster took his details. (which would include passwords and IP addys) and copied it to other sites, including a child pron site.. certainly plausible, the webmaster wouldn't necessarily want to charge it multiple times as charge-backs can kill a payment processor (it would have been done 1 time on hundreds of cards to generate revenue with the fewest charge-backs, kind of like doubling your business income). most people won't bother phoning their cc company for a £10 or so unexplained charge fewer if it looks embarrassing , not sure if its likely but that means it will happen sometimes... which to me would make the conviction unsafe.
don't know about anyone else but I'm not at ease with people getting convicted on child porn charges when they didn't actually find any child porn.. i mean maybe he's particularly sneaky about it but it just seems wrong to me...