In the final boardroom where Sir Alan decides who is hired they recorded both Claire and Lee winning. The Claire winning version was sent out as a 'preview' copy of the final episode to those who got their hands on it earlier in the week, which is probably why Claire was the favourite to win yesterday. I think he only made the decision the other day, as they filmed You're Hired on Tuesday night, my guess is that on Tuesday Lee found out he was the apprentice.