See Sidnie Ward at 1:53, some way off the lead. Again at 2:33, now in 5th place. At 4.05 we have Kieran Allgood charging through. into 3rd place. Again at 5:47 - unclear what his position is. At 7:13 he's on the leader's shoulder (NB: verbal comment). 8:27 Kai Boggon sets off in 2nd place on the last leg. At 11:20 Kai has taken the lead! At 12:36 he's extended the gap and we hear the shouts of "C'mon Kai!!" And finally, at 14:10 we see Kai already bent over as the 2nd man crosses the line.
Thanks for the video Mark Hookway of Tonbridge!