I’ve not done the Cambridge Half but it looks like a great event. Given the size of the field it would make sense to arrive with plenty of time to spare. From my experience the Park and Ride services can take a long time, so keep that in mind.
The course would appear to be relatively flat although there are certainly some undulations. The video makes the experience of running through the college grounds look amazing and I’m tempted to sign up to this race myself.
Some of the route looks quite narrow so that might prove problematic towards the start of the race but could be a good thing to avoid making that mistake of setting off too quickly.