According to the Post:
“There is currently a maximum field limit of 14 runners for the race, which would mean Constitution Hill needs two horses to come out to be guaranteed a run. However, stabling capacity limits at Southwell could see the maximum field drop to 12 runners, meaning he would require four to drop out.”
I would be confident about two horses above him not running. Four starts to get a bit more uncertain.
I wonder if Henderson and Buckley will be ringing around some of the other trainers?