There are engineering works between Biggleswade and Stevenage that day. Hull Trains seem to be operating the following:
11:10, 13:10, 21:11 Peterborough-Hull
08:25, 10:30, 13:30, 15:30 Hull-Peterborough
Grand Central seem to be operating:
06:51, 08:21, 17:23 Bradford-Doncaster
13:09, 19:09, 22:00 Doncaster-Bradford
06:43, 12:18, 17:29 Sunderland-Peterborough
08:30 Sunderland-Kings Cross (this doesn't seem to have any additional time allowed south of Peterborough)
07:48 Kings X-Peterborough (the timings look right)
12:10, 18:05, 21:05 Peterborough-Sunderland
Timings obtained from
http://www.opentraintimes.com/search/location
I would imagine that it is possible that timings will be revised further, and that passengers weith GC Only and FHT only tickets instructed to use FCC services Peterborough-London.