Can't believe
Colchester is only four minutes. Especially taking the xx:30 Norwich to London service, if you need to change at Colchester for Chelmsford, Shenfield, Stratford, etc, it only gives you as little as four minutes (and at best, seven), so if you are disabled, travelling with family, luggage, etc, it may be best to either take a direct train, or use the next one after that. Like imagine being at the front of the train. I am not sure if delay repay would work if you took the xx:45 train instead of the __:33.
This is coupled with the fact that UK trains often start moving at the time shown, rather than to close/lock doors so realistically, you may only get a couple (2) of minutes which shows this is one of the tightest official connections outside of Crossrail stations which are simply just leaving the train and hopping in the next.
In addition, the fact that the official National Rail website doesn't state the MCT, but BR Times do gets me.