I think that with regard to the litter at the start of the M23 link road....there is a Macyd on that roundabout.... ( I know cause that's my near airport hangout waiting for my friends and family to call me they are through customers baggage collection and Duty free and ready for a pick up...) that maybe the source is said detritus
Back on topic wonder why you don't get a follow up ' how did we do ' request for feedback of your experience??