This is the full sequence:
1st. Quarter: 4,3,2,1.
2nd Quarter: 2,4,3,1. 2,3,4,2.
3rd Quarter: 4,2,3,1. 1;3,4,2. 4,3,2,1.
4th Quarter: 2,4,3,1. 2,3,4,2. 4,2,3,1. 1,3,4,2.
More info:
The Westminster chimes are the same notes first used on the clock in the University Church tower of St. Mary,Cambridge,England,and in 1859, selected for the St. Stephen,s Clock tower in the Houses of Parliament London..