I think the adverts you see on here are directly related to your surfing habits. On his earlier thread, BA could see adverts for trains, whereas I could see adverts for Velux windows.
I'd been looking for instructions recently about loft windows, so it's reasonable to assume I have cookies on my computer related to this search, which affect the sort of adverts I see displayed here.
I suppose it's reasonable to assume BA has recently been looking up train times, or buying rail tickets online. I now wonder if Joe sees adverts for redtube.
Do tell us Joe (he won't)