I don't have a problem with the process. Is it common knowledge there? Maybe try aksing people what ashes are. I know it can be a touchy subject but I was pretty old when I found out in America.

This is Britain!

Most town museums of any size will have an Iron Age cremation urn full of burnt bone fragments on display. The ashes weren't exactly ground up back then.

https://learn.folkestonemuseum.co.uk/objects/iron-age-cremat...