They list BBAR and/or district events separately. Also things like middle-marker and womens or juniors events have separate entries.
The two you highlighted I have no idea which is which and which one normal people should enter. The only difference I can see is "preference to Women and Juniors"
The F11 event is definitely at 1400. I just entered it.
I'll have just stepped off a plane from Peru so will be either ridiculously jet lagged, or I'll be benefitting from 2weeks at 3-4000m :-D.
edit: ah I see... I don't understand why so many events are listed twice... e.g. https://www.cyclingtimetrials.org.uk/race-details/11958 and https://www.cyclingtimetrials.org.uk/race-details/11956