Expert John is seen with his head in his hands as Jess declares she has fallen in love with Dan.
Later on the clip shows the three experts regrouping outside with John declaring 'this does not sit well with me'.
Mel agrees with him and the appear to be at a loss to what to do as a voiceover explains they face their biggest dilemma the experiment has ever known.
Will they let Dan and Jess stay, despite breaking the rules and cheating on their spouses?