Sadly, I can't claim to have come up with the water theory, fitting though my name is
(and rather appropriately, Eau Rouge is actually in Belgium...)
I watched episode 6 again last night with DH and noticed a few more things that people were asking about.
The embargo on Ian's house expired so wasn't lifted by anyone. Georges had something to do with it in the first place. He could be incriminated on the tapes but I think it's more likely that he knows about Ian and wants to keep it quiet because Ian kept the bribes coming.
Baptiste's reaction to the tapes is a bit odd.
Mark believes Emily's crappy lying about where Tony was on the night Ian was killed. Worst cop ever? Or is he trying to cover for the pair of them? He says he can't believe she would lie for Tony- does he already know something about their relationship? Or have I just got too much time on my hands?
My DH tends to make jokey comments all the way through TV shows. Last night was no exception, but he did make a very good point; the video of Olleh in the house shows him waving ('Look, he's having fun- he's waving!'- thanks, DH). Who was he waving at? He couldn't have known he was being filmed, he was just a tiny bit in the background. So he must have seen someone to wave at them.