Did this about 6d19h ago!
The bad news:
"reclining" - well basically they don't. They're fixed, and a frustrating shape where the back is kinda slopey, but the head "section" is bolt upright; a totally useless position for sleep. For me, anyway. I saw people slumped on their loved ones, and a loved one with a blow-up travel neck pillow thingy (never used one myself).
(And the temperature varied enormously for a modern train - from a little too hot at 11pm, to a bit nippy by 5am.)
The good news:
You're very spread out. Carriage is only 3 seats wide (2+aisle+1). And mine was less than 1/3rd occupied; so it was easy to bag a double-seat and spread out over that. sadly still less comfotable (and smaller) than our sofa.
(you can see how busy your train is on the web as you book, although the interface is VERy odd IMHO!).
There were absolutely NO on-board announcements
(Despite the thing running over an hour late )
But I definitely got some sleep.
This was from Dundee - its possible that they use different trains from FW.
Interestinglky most folk got off at Crewe, not Euston.