Hi Its quite a while since I was at Holmston cemetery,sometimes there is a chap at the gate house,think its just luck or maybe when a funeral is on,he has books he can refer too,it will give you the name and date of burial,however if its a paupers grave he can only point you in the direction if the area,hope this helps,maybe phone south ayrshire council and make enquiries,the number is 0300 123 0900,wait for the option to speak to an operator,they are very helpful.
Regards
Mikayla