I think Tom and his mate have got the rape on their phones by perhaps don't realise that's what they're watching. Would explain the bright light that Trish saw. The stuff going on with Daisy is how the footage is discovered on the phones.
Not sure there's anything else going to happen other than Mark's revenge wrt Joe Miller reappearing. Can't see them going the way of the American version (which was shit btw, don't bother watching it if you haven't already).
Not sure who did it though. I don't think it'll be an original character from the first series though.