I checked that link, hoping to find that there is now kosher food in LHR terminal 5 where I will be for six hours on a stopover next month, and found this "Caffe Nero Terminal 5 Departures (Landside) 020 8283 5056"
Does landside mean I need to go through customs to get to to Caffe Nero? I assume that they just stock sandwiches, the whole Cafe isn't kosher, right?
I know this thread is old, but it was the closest to relevant I could find.
Thanks!