Taking into account that a special constable did a computer check on someone, and as you say it is logged, date and issued with a code. How could i find it if this had happened, how and who i contact to find out if a check had been logged.
If you believe that an unauthorised data search has been carried out by any police officer, relating to yourself or to someone whom you are representing, you should submit a complaint to the IPCC. Details of how to do this are here: http://www.ipcc.gov.uk/index/complainants/who_ complaint.htm