Why is one going to Heathrow Airport.?
Is one going there to check-in for their flight to have a beverage or few before flying, perhaps even buy a newspaper in the process, or is one going there to buy the latest mobile gadget?
I recall when the missus and myself were our shopping for bedding, curtains etc. for our 10 guest rooms and equipments for our restaurant and kitchen, some twits were standing there demonstrating one of these tsunami mops trying to flog us a mop and bucket.
"Anytime we need a mop and bucket we'll let you know, until then bogger off"
It's very easy to disregard commercial advertising despite it being shoved in one's face.