Originally Posted by
Geordie405
Interesting! When I asked about the missing PreCheck I was told it was because of the SSSS at LHR and should resolve itself en route once systems had been updated that I had been screened and was on board. At the end of the day PreCheck is never guaranteed so I suppose part of it is randomized to keep you guessing

Agree. Never guaranteed. However having it on my mobile boarding passes for both of us one would expect it on the printed version from BA.
As it may not be possible, no issues there. Just was surprised that two people had never heard of it.