The plot thickens. She just called saying his definitely not been drinking, and that she only stormed out because she didn't want to take the test in front of the kids. The thing is, I first approached her in the bathroom, and that's when she then ran out in to another room at the other end of the house where the kids were already playing, so that was entirely her own doing. Anyway, I said I'd be waiting for her, and I'd be happy to be proved wrong. I asked her where she was, and she said that she didn't know, but she was quite a way from the house. Hmmm. She's only been gone 20 mins at most, so she can't have got far. I hope she's not trying to run the clock out or beat the machine somehow...