Lets see - he asks about aircraft seen over the UK the morning of 14 January 2015, and someone says they were aircraft that were filmed en-route to the western US
before the 7th of January 2014, as this video of one of the in-flight refuelings was posted to youtube on 7 January 2015.
https://www.youtube.com/watch?v=d6EN33o7-cQ