An interesting question I had when I was travelling out of Heathrow T2 last week. After the main terminal's security check on departures, I wandered around a little bit and then wanted to check the cafés around the Satellite terminal - the so-called "B gates".
On the information board it said that "Do not go to B gates until you see that your flight would depart from there" (or something similar to that). I am very curious about the reasoning of this. It was not a nighttime flight or overnight flight or anything, and the airport was busy as normal, so I ruled out the possibility of them trying to minimise someone hiding at somewhere at the terminal.
Is it because of the road to B gates is (physically) next to the UK border on the initial part? That came as the only reason to my mind. To put it more clearly, it is just that the walkway to B gates is physically next to the arrivals UK border and I thought that maybe they do not want too many people wandering around there for security reasons (I guess)?
The rule seemed so odd to me that's why I wanted to ask to see if anyone has any info on this. Thanks!