It’s lunchtime. You’re British Airways. And you’ve just cancelled all domestic flights (and a fair number of European ones) leaving Heathrow for the rest of the day in response to the unfortunate fog.
This is what all your self check-in machines revert to.
And given BA's continued cancellation of all UK domestic flights in and out of Heathrow today (Thursday) and tomorrow (Friday) ... you could be seeing more of this!