Townlink have brought in a very poorly publicised new timetable on the 21, with the last two journeys to and from Brentwood on weekdays axed. The Gazette mentioned it last month.
The last 21 towards Brentwood on weekdays now departs Harlow at 1600, Epping Station at 1629 and Ongar Four Wantz at 1650. The last weekday 21 towards Ongar and Harlow leaves Warley at 1730 and Brentwood High Street at 1742.
The Saturday timetable looks like it is unchanged.
See the full new timetable here.