Are you trying to find where she is buried or cremated or just details in general such as where she died? Is there a particular reason or is it just for ancestry purposes?
I just noticed that you are in Australia. However you say that you’ve just been looking on the Internet for the UK so I assume it’s a UK question. I’m going to answer as though its UK because there is some urgency to this. If it’s Australia, let me know and I will transfer categories.
There is no central register of wills in the United Kingdom. There have been many attempts to get solicitors and people making wills to participate but none have gone anywhere.
Hence, it is just a hard slog of writing to all the solicitors in the area where the deceased lived may have written a will and putting a note in the local newspaper and the London Gazette (deemed to be a notice to the world).
Solicitors routinely get letters from other solicitors asking whether they hold the will and solicitors will respond albeit not in a particularly timely fashion. If you know the executors of the will are, they would normally have been told where it’s kept unless it’s in the house if your late sister own a house in which case, it may still be there or, removed with any other papers which have been removed from the house if they have indeed been removed. In circumstances like that, it’s not unknown for Wills to be inadvertently destroyed.
I wish I could give you an easy answer to this but solicitors have been looking for an easy answer for years and yet they are unwilling to participate in the scheme to make it easy. I think the reason for that is quite simply because documenting all the wills they have historically would be a gargantuan task and they seem to think that if they can’t do it for all the wills, is no point in doing it for a few.
There is no central register of Wills. There have been lots of attempts
Can I clarify anything for you?
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You can write to all the solicitors that you can find in the high Street in Western Super Mare which you can find from the Law Society’s website.
You can search by town or postcode.
you can place a caveat at the Probate Registry which would flag up when someone applies for probate. https://www.gov.uk/wills-probate-inheritance/stopping-a-grant-of-representation
It is worth mentioning that there are strict timescales for contesting a will depending on exactly why you’re contesting it.
The Office of the Public Guardian will have no interest in this. They may have had an interest in the guardianship but not the will.