Questions about burials

I want to bury ashes into the grave. Why do I have to decide whether there will be any more burials before this can be done?

It is against the law to disturb human remains without licence (including ashes in a casket or urn). Therefore no further burials will be possible in the grave until a licence has been obtained.

Ashes can be buried in the grave at full depth, in which case they will not be disturbed by further full body burials. By having to excavate a grave to this depth there will be additional charges for opening the grave.