It was 9pm last time, but they thought it would be 8pm, that's why they've hotted it up (is that a phrase?) this time around.
We asked Tom about the change to Friday and he was dismissive of it, saying "Does it matter, there's iPlayer". Maybe he was just defending his employer, which was noble of him, but yes, I think it does matter, particularly when it's up against a well-established show.
Fancy I think you need to download. I've got 4 devices to put it on, and they're going to be on continually!
Really, though, 5,000 people being representative of a country with a population of over 60 million. It's crazy. 
Off to do a re-watch to calm me down.