Drivers with more than 12 points on their licence

I know that this has been a contentious issue that has been floating around some of the cycling blogs for a while, but I found 2 sets of numbers that were just over a week apart that quite interested me today.  I did a tiny bit of analysis on them, and then sent a FOI request to the DVLA.  The analysis that I did on the initial data from other people is below.

Points	16/05/2011	24/05/2011	Diffrence
12	7014	6983	-31
13	804	809	+5
14	881	870	-11
15	1093	1075	-18
16	296	297	+1
17	147	144	-3
18	245	233	-12
19	38	37	-1
20	49	46	-3
21	38	39	+1
22	13	10	-3
23	16	15	-1
24	24	24	0
25	3	3	0
26	0	0	0
27	3	3	0
28	1	1	0
29	0	0	0
30	4	4	0
31	0	0	0
32	0	0	0
33	1	1	0
34	0	0	0
35	0	0	0
36	1	2	+1
Total:	10671	10596	-75

Is that one extra driver with 36 points the one that has gone from the 23 point place? or is it someone new, or have more than one person jumped about or what. I find this puzzling, but suspect that the simplest answer is the best; that it is simply a mistake on the part of the DVLA.

I would like to thank both Freewheeler (his blog post with the data from 16/05/2011 is here) and Amoeba (his comments on this blog post have the data from 24/05/2011) for asking this question ahead of me.

I'll post more on this once I've had a response from the DVLA.