DVLA response times for information are typically pretty good. It would be a very unfortunate series of events if the PNC did not have correct data for the OP's registration, police were timely in asking the DVLA for information, but the DVLA took weeks to provide it. Its much more likely that the police were simply tardy in issuing the NIP and are taking a chance in hoping that OP doesn't know the limitations on the serving of a NIP.
OP should cover that angle off by submitting a subject access request with the DVLA ASAP, which will tell him which parties have accessed the record for his registration.
OP should cover that angle off by submitting a subject access request with the DVLA ASAP, which will tell him which parties have accessed the record for his registration.