The couple you see don't need to travel together!
Feel free to push between them and seperate them so that the one left behind has to guess which station in the chain their partner will wait for them at -- they love it! It's not like they paid twice what you did, or there is another train that you could get.
Also, I'm told it is good manners, on encountering a family, to trap the teenage daughter in the train door as the, obviolsly stupid, girl tries to join her parents.

If I lived in London I'd have been arrested for killing a commuter by now.
(Me, I'm not... in any way intoxicated, Wed 29 Sep 2010, 18:02, Reply)