Hmm, I think Clive the taxi driver is involved in the rape but I think there was a second person filming it on a mobile phone (hence the light Trish mentioned). Could it be Clive's stepson or even Ellie's son?
The vicar is sooo dodgy, he has to be guilty of something, even if it's only, not revealing a confession from someone else.
Was Pauline Quirke's character not terminally ill at the end of series one/beginning of series two? I'm sure I read that somewhere - probably DS.