I notice it when I'm sat down, after eating a meal and when lying in bed - more at night time than in the morning. I don't sit down much in my job, so it might be moving loads all day, but I don't notice it unless it's a really big whack.
Some days definitely more movement than others though, and I know I probably should take more notice of it, in terms of patter etc, but I quite like it when it's NOT moving so much - it's better than being kicked in the bladder all the time. Also have anterior placenta.
Today after the Lucozade in the hospital, I was sat in the waiting room and actually felt a full on somersault - feet moved up under ribs and everything, as if it was kicking itself round. Then back to bladder kicking.