I was on the last Mk2/3 service last night from Aberdeen as I mentioned above. The seated coach was out of use due to a door being locked out and the lounge car had no power. I was upgraded to a room, which I got solo occupancy of.
In the morning I took the opportunity to get some pics-there was a member of staff sat in the lounge car, and someone else (I presume staff) sat in the very toasty seated coach. Otherwise they were completely empty. It was a shame the lounge was OOU though, a farewell party to the old stock would have been great. There was no food/drink service whatsoever, apparently breakfast was served to rooms in the morning but nothing for us that should have been in the seats.
We were allowed to sit in the lounge in the morning if we wished, arriving into Euston in the morning peak sat on a sofa was a bit odd! And the last time anyone will ever do it.
I've put some of the pictures on below, most won't upload due to the files being too large. If I find a workaround to that, I'll post the result.