I thought the final 4 week was the final episode.
They do go home, but I thought it was for ages, like a couple of months - the differences between the final 4 at the ranch, to the final 4 at the final episode is amazing - they all lost loads more at the end.
I just dont think they show any of the at home bit - the last episode is all studio and fireworks etc.
Having said that, I think when it was on Sky One last year -there might have been 2 episodes, they just showed them both on the same night, so maybe it just seemed like one really long episode