If one of your relatives who may   have been planted in any of the Cardiff Cemetaries like Cathays [open in 1859] andThe Western Cemetary,The Records of who was buried where are kept in Thornhill Cremetorium,Caerphilly Road,Cardiff.They may give you the information over the phone for free?Otherwise,They DO Charge a fee for dishing out information.They gave me lots of info on my lot,when I started this hobby back in 1982, for free.But alas,That was THEN! Do a "Google"for information of their website/Phone number. P.S; 6 of my great,grandparents are Planted in Cathays Cemetary.The other 2 are in Western Cemetary.All in Cardiff. HTH;Graham.  Graham Williams, Glam;FHS# 551. of Canton,Cardiff.