You guys do know about this web site don't you?
http://www.airhistory.org.uk/spitfire/home.html
Spitfire XIV serial numbers,
MT847-MT858,MV246-MV273,MV286-MV320,MV347-MV386,NH637-NH661,NH685-NH720,NH741-NH759,NH775-NH813,NH831-NH846,NH857-NH871,NH873-NH875,NH892-NH929,NM814-NM823,RB140-RB189,RM615-RM625,RM648-RM656,RM670-RM713,RM726-RM770,RM783-RM825,RM839-RM887,RM901-RM943,RM957-RM999,RN113-RN160,RN173-RN221,SM812-SM842,SM876-SM899,SM913-SM938,TP236-TP240,TP256,TX974-TX998,TZ102-TZ149,TZ152-TZ176,TZ178-TZ199