I'm not sure if this is what Russell meant when he talks about Urban Spam but this story from Brand Republic is certainly "oppresive commercial clutter".
British Airways staff have reacted angrily after Virgin Trains staged a guerrilla marketing event on one of its planes. A Virgin team, including a dwarf wearing a T-shirt emblazoned with the line "Shorter journey times on Virgin Trains" and a man in a chef's hat promoting its breakfasts, boarded an early-morning BA flight from Manchester to London. A Virgin spokeswoman said stewards wanted to stop its team boarding the plane. One tried to prevent passengers seeing the slogan T-shirt by standing in front of it. "It is good to see Virgin has realised the fastest, most efficient way of getting its employees from Manchester to London is on the BA shuttle," said a BA spokeswoman.
I love a bit of guerilla, but this would just piss you off. The flight is a short 40 mins, the plane is cramped, your hungry, you're in the middle of a stressed day, you've had to fight your way through the airport and now you're faced with a living breathing marketing dwarf.
I think that would just send you over the edge.
Seems like Virgin Trains are gunning for that London - Manchester route. That's what all this was about.