apparently it was 2.3-2.4 judging by different Strava segments, so 2.8 is a wee bit of an exaggeration (or maybe from Finish to Hall?).
Anyway it was almost totally felt and almost all good quality path so should have been faster than anticipated for most.
Part of the problem is that too many events over-egg the distance to the start and people get used to arriving early and having to hang around and wait.
There's just no pleasing some people!
It wasn't bothering me as I always leave plenty of time to get to the start - I like getting there early - just commenting!
Have just read the controllers comments - I walked back from the finish with Richard Oxlade and the distance was one of the things that we discussed. He admitted that as controller it was not something that he had considered. Perhaps for the sake of consistency and to avoid the problem of people arriving late it is something that should be checked by the controller?
I agree (he says quickly passing the buck ;-)