Plod know the database is majorly unreliable, no court in the land would convict you of the offence, no cps would run with it either, as they have to show intent to evade, that is the basis of the law they prosecute you for.
Same as if you take a cake from a shop without paying and then put it back ten mins later, they can't do you for theft, which is in legal terms to "permanently deprive" owner of property.
The database is so good, me other halfs car is still not shown as taxed, but was done in APRIL, at the DVLA local Office in Norwich, when stopped earlier in year in the car it showed as being uninsured, for me to drive, even though the cert clearly stated I was and had been renewed over 6 months previously.
tabetha