"The DVLA does not sell driver information. Where the law requires information on vehicles and their keepers to be released to third parties a fee is levied to cover the costs of the transaction only so that the burden does not fall on the tax payer. The DVLA does not collate the number of such transactions."So there you have it, the DVLA does not sell your information except when it does and it doesn't know when that it is, but it does know it happens.
Glad that's sorted... competence knows no bounds!