Going north bound just before the tunnel there is a red double decker bus parked up/dumped and every time I drive past it there are people in the top at the back. Are they squatters? Or is this a new type of dogging concept? Any ideas? 
Looks like someone crunching numbers on tunnel users…
Take a look here,
viewtopic.php?t=130834&p=2046425
Thank you!
They also look out for ADR trucks you dont pull into tunnel control