The Wedding Situation

An Invitation to a wedding in London for her sister causes a need to find a partner in travel to play the part of boyfriend. Deb recruits Rodney for the task and they set out on their adventure. Best friends in the real world, the occasion seems to open the opportunity for my than just support. Could there be a romantic interest that has been hiding in plan sight?

Whay does she need him there? 

Is there more going on than just attending the wedding?