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Thank you very much everybody. Really interesting! Final question (she says rather optimistically), is she entitled to contact the Inland Revenue to request a copy of the deed of variation? The solicitor, as already mentioned in my original post, says the paperwork their end has long since gone. Unfortunately, the piece of jewellery in question, highly unique, was still very much in evidence at the funeral of the original benefactor's daughter!
My friend is adamant she never even knew it was left to her until another mourner mentioned it was strange to be seen adorning somebody else 25 years later! Seems like a very well kept family secret!
IF no deed of variation can be traced, as you rightly point out, it was a long time ago and as my friend has the original will, where it states categorically this piece is to be left to her, she swears nobody ever informed her of this at the time and she most certainly did not sign anything giving it away to anybody else, and of course, IF she has the desire to pursue this, what should she do?