Crematoriums, cremation, ashes and so on...
Many church yards, in addition to having tradition burial plots with headstones, also had either a wall of rememberance when plaques can be placed in memory of people who have died, but who belonged to that church or parish. The ashes are not placed there. Sometime the ashes are spread at a favourite place.
Sometimes the ashes are brought to the church, usually a few days after cremation and buried in a plot, and the name of the deceased added to the headstone, or a small engraved stone placed on top of the grave.
Some places, including Rushen have a strange arrangement of cremation headstones. These are small headstones placed in narrow rows which remember the deceased. I'm not sure if the ashes are buried in front of them or not!
Hope that helps!