I really enjoyed the Christmas special. Harry and Tamzin were most enjoyable to watch, followed by Josh. And I agree with pp that each of them would be great on the main show. I can imagine the producers will be trying to get Harry on, in particular as he is just very natural, charming and likeable.
Tayce was good, but as a pp said, it WAS messy and frantic, which made it uncomfortable to watch. It was nowhere close to being a 40 and lacked the polish of Tamzin's VW (even with her mistake). The lift was impressive though so think that, combined with the pimp slot won it for them.