We travelled back on the 09:47 which arrived into Paddington a couple of minutes early, but it's not quite as relaxing as the sleeper
I hope the 0947 was on a different day. I'd want at least a day to explore the area before I returned.
I have not had a problem on any of those trips - apart from on one occasion someone trying to claim my berth, but it turned out they were a day early!
Earlier this month at Schipol two young ladies were turned away from my flight at the gate because they were a month early. The ticket barriers into airside let them through apparently.