I had a flight in mid jan to LHR. As I seem to be doing way to much now, I was sitting in the lounge refreshing the mobile website looking at my booking and then bam seat went to none, big smile refreshed a few times still blank, went to gate, no beep for new boarding pass.

Got onto plane - it was EMPTY! No idea why my seat changed to empty.

But Ended up having a full row of 4 to myself and as I only wanted to sleep was kind of like an upgrade - seat was longer than even first class