DVLA revords versus reality

[livermoreb]

I recently received the latest edition of the BOC members register and, being a 410 owner, turned to the records of 410 owners in the lists.
I was surprised to see 35 410 cars listed, especially as I had looked up the car in the How Many Left website to see that only 8 were shown shown to be still on the road.
Being an inquisitive type, I looked into this discrepancy and found the following:

14 cars are registered as being currently on the road in the UK,
8 are shown as being overseas,
1 is currently on SORN,
1 is shown as a Volvo and untaxed since 1987,
1 came up as not known, and
11 were shown as being registered as Bristol BLMC.

My own car was shown as BLMC when I bought it so I pointed out the error to DVLA and they changed their record to show it correctly as a Bristol. I was left wondering how this mistaken identity arose. Does anyone have the answer to this?