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If your mother's owned a flat then a grant of probate will be required in order to transfer the property from her name (ie. to a purchaser). The Land Registry will not register the transfer without it and the purchaser's solicitors will expect to receive a copy as part of the pre-contract package once the sale has been agreed in principle and pass to respective solicitors. Info here:-
The institutions may allow the assets she holds to be released to you with your brother's consent but it depends on the value of the assets and the institutions particular policies on the matter.
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