As people sit themselves down there and never even look up to clock if someone else needs the seat more than they do. I try to avoid sitting in those seats (the designated ones on the tube and the front section of the bus) so that they are left free for elderly/disabled/heavily pregnant people but it amazes me how many able bodied young people sit themselves down, get out their newspaper and don't look up. Several times in the last week I have given up my seat on the bus to an elderly person because noone else has bothered - I am 5 months pregnant and generally don't mind standing (I never get offered a seat anyway) but getting sick and tired of getting shoved around and elbowed in the stomach and would be nice if someone else showed some consideration! Rant over.