Series 6.
Team 5 actually died on a room with the spider.
Assuming that the following and last team of the series (team 6) who were one of the youngest teams EVER would not win, the producers allowed Ben et al to refilm that room and continue to the end and team 6 were therefore not allowed to win directly afterwards.
Team 6 were robbed. 
and not only robbed but prematurely killed by the programme makers.
THE END.