Oddly enough, in 2003 I wasn't too concerned with finishing PBP for myself. Heather had failed in 1999, and It took the shine off my own finish. When I got knocked off by a scooter at about 900km in 2003, Heather was slightly ahead.
I was only very bruised, and recorded a video message on a camera to send to Heather via the organisation. I then spent three hours sorting out the paperwork, and the two buckled wheels.
I would probably have made the time up, but for an off-route detour. After that, one of the volunteers carried my luggage to help me get a finish, for Heather's benefit mainly. I finished two hours late, but with a note of the three hours delay in my Brevet card. I got 90 hours, rather than 89 hours.
So, I had consulted with the organisation with 300km left to ride, and they were aware of my progress during those 300km. There wasn't a retrospective adjustment. Similarly, the extension to LEL 2009 was decided on at Alston on the return. It's very difficult to implement changes once the event is over, as those who were out of time at intermediate controls, and stopped, are at a disadvantage.