I was surprised to see Mark walk as the dullard lovesick Aden or the mixed-up womaniser Aaron would have been prime candidates to walk from the house as they have reasons to want to leave.
Mark could have easily 'walked it' to the final of Big Brother (excuse the intended pun) and although his behaviour was erratic, verging on odd he did not have a bad bone in his body. He was like the court jester of the Big Brother kingdom so it will be even less entertaining now. I suspect he was simply bored.
I thought originally he was a plant and him walking out just endorses that feeling in my mind. But I guess he thought it was time to go. I feel that after watching the tapes back he might live to regret it when he realises he was in with a chance of winning.
What do you think about Mark walking?