Rule 4:
'Competitors who have not passed Ribblehead in 2hrs 10 mins or Chapel-le-dale in 3hrs 30 mins will be timed out. An authorised doctor may stop any competitor at any time. Competitors who retire must advise the nearest checkpoint as soon as possible. If the nearest checkpoint is not the finish retirement must be reported again to race control as soon as possible. Competitors who continue to run after disqualification or who do not report retirement correctly endanger other competitors and face an extended period of disqualification from future races'
I've done the race a couple of times and think the Ribblehead cut-off feels tighter than Hill Inn