Good morning, Guy and thanks for your reply.
Yes, I've been working on the understanding that registration of a burial was a legal requirement.
As for burial at home, her son, the informant, had travelled to Leeds from Dumfries. He'd had an horrendous upbringing so I cant believe he'd take his mother back to Scotland and bury her in his garden. Taking her ashes back following cremation, as mentioned by Brian, would make more sense but I still ask myself why would he want her near to him. However, I've made assumptions before and usually been shot down so I could well be wrong here in which case, it would be the end of the search.
Thanks again.
David