High placenta is good and posterior means you'll feel far more kicks (mine is high anterior).
Measurements from scan at 22+2:
Head circumference : 195.7 mm
Abdominal circumference: 176.2 mm
Femur length: 36.5 mm
Fetal weight: 473 g or 1lb 1oz
All my measurements come with little graphy-like things to the side (sorry, useless description). It shows min and max and average lines and little dots where my baby falls, so it gives an idea of how big baby is. Head circumference is absolutely average for 22+2; abdominal circumference is larger than average; femur length is just below average; and weight is just below average.