Hi, M D,
Sorry to have taken time to get back to you but didnt get a message saying about your post until lainie had posted today.
First time I have heard that grave numbers on death Certificates.
Anyway had a look on my database, which was provide by Notts Family History Society, but no grave monument for grave 15540. I did however find that there are 18 Meats surname on the dateabase but none with a grave number, so if you can give names and dates you are looking for I can see if they are there. As for Surname Graham there is one grave monument for a Robert Charles Graham and his wife Mary and looks like 8 of their children all not named on stone but the grave number is 12450.
As for grave 15540 when Nottingham Archives reopens after the lockdown when ever that will be I can check the burial records for you.
Lanine,
i don't think the achieves now have the database on their computers anymore well not the last time I was there anyway and that was just before the lock down began.
All the best and hope you all keep well
NG