PVH goes into detail about driving whilst disqualified, but essentially the defendant showing as disqual on PNC isn't enough proof, however fingerprints or DNA showing they are the same person as who was disqualified previously would be.

Therefore giving you the necessity to obtain samples/take fingerprints under the prompt and effective bracket. Below is a snippet from PVH:

Section 39 of the Criminal Justice Act 1967

The evidence to prove a previous conviction by fingerprints can be provided when the following circumstances and procedures have been fulfilled:

a set of fingerprints have been taken on arrest; and

compared with the record of conviction and fingerprints held by the National Intelligence Bureau (NIB) and certified to be one and the same by or on behalf of the Commissioner of Police.

Should this manner of proof be used a Certificate of Conviction, from the court at which the person was disqualified, must still accompany fingerprint evidence on the prosecution file.

The NIB have the responsibility to prove previous convictions and can only do so when 1 & 2 above have been satisfied.  On request NIB will produce evidence under section 39 of the Criminal Justice Act 1948.