I'm sorry if this has been covered already, but I've not watched a big brother for a good while!
Helen has been granted a pass to the final, but when do channel 5 normally open the vote to win?
In past big brother's voting was for the whole of the final week with an midweek eviction of some sort. Those votes for surviving housemates to win then carry on to final night.
To open the vote to win, they'd have to include her. Could there be a chance she'll be vulnerable before the actual final night itself?

For BB12, Tom was evicted the day before the final for being 5th in the final vote, but I think all those who reached the final vote in BB13 & BB14 reached the final night too.

At some point in the final week. Wouldn't make much sense doing it any other time.

Yes. It just hadn't occurred to me previously that her pass must end when the vote to win starts.