Why don't you contact the organisers direct? I think you will find the cut off time for day 2 is quite generous.
This is what I most dislike about this event. Organisation on day brilliant. Information pre event piss poor due their apparently sole reliance on arse book. Why they do not send e mail information and updates as do most other race organisers?
I ran Abingdon a few years ago and inevitably was with the stragglers. There was a long section of fairly narrow road where the traffic was fast moving but which had a single pavement on the other side. I crossed over so that I could use it and got yelled at by a marshal to get back on to the road. A few miles further on I got sworn at by a motorist who asked why wasn't I using the f*cking pavement! Can't win.