I think one of the things that doesn't work in his favour is Jonas himself, who every time I've seen him do UK promo looks varying degrees of bored, confused and bemused to be there, as though he's been sent to some provincial backwater town that he thinks is beneath him. I did wonder if it's just that he's a bit awkward in these situations, which is fine, but having seen him switch it on for the likes of Kimmel, Colbert et al, I don't think that's the case.
This! He is hot and got some bops, but that's the exact same impression I got when I met him in London a few years go. A small group of young, female fans were waiting for him and asked for a photo. He was definitely not impressed and seemed rather annoyed by it all. One of the girls started crying, she was so disappointed. He might have had a bad day though, I don't know.