UA's ICTS contractors at LHR put ICTS stickers on the passports of those attempting to check-in yesterday and then sent the passengers to the check-in counter. After the check-in counter staff noted problems trying to find the passenger, the check-in staff directed people to "additional services"/ticketing counters closer to curb-side. That is the most common way these Great Dane ticketed passengers are handled at LHR.
Those stickers have the date on them. Also, who doesn't have a smart phone with a camera? Email of the photo or video also works. Come on. Document as needed.
