I would love to see a reunion with housemates from all 3 series. It would be good to see what they thought of the show, what they got out of it, whos on talking terms, how the relationships are going (P&H!!!) and basically to see what they are all up to.
I think the most appropriate time to do it would be after the last series which could be a while away but to get all contestants together - 2 years is a while to wait but I think it would be the best time to do it, like a Big Brother celebration.

Lets hope the producers think of this one.