I'm not sure if we are watching ahead of time so I'm wary of spoilers, but as soon as I watched the episode I've just seen I immediately came on to Mumsnet to see if there was a thread. I was agog, and I will say no more. DH has confirmed it's tonight's episode actually.
As a complete side note, my favourite thing about this series is watching Marcus completely grey rock Gregggg and his inanities.