I just now watched the show and I noticed that guy too. No idea who he is. I also noticed that both Robin and Oti looked bored and miserable while waiting for the winner to be announced. I can sort of understand Robin - knowing he didn't have a chance - but Oti's partner Tom scored a 40 just like Harry did. Maybe they knew who the winner was, since this was recorded and it might have needed more than one take for the winner announcement. Loved the carer kids part especially.
Oh and Anton given a solo with Joanne - and he also had one on the regular show even though still in the competition, also with Joanne. And he was so happy at the end when he went and picked Claudia up and swung her around. Well, that was before coming 4th in the final I guess - but I don't remember ever seeing him so happy.