If you had a choice between two schools, both offering the same-ish SEN support, one with a progress 8 of 0.18 and one with a P8 of 0.49 which one would you choose? Both the same size intake but second (0.49) is undersubscribed so the confidence interval is wider than the first.
How much should P8 scores (especially as both fall into the above average category) influence a decision?