Initially, only Executors of a Will have access to the Will and its contents, but they do not have authority to close accounts or sell assets such as property & shares until the Courts have provided the Grant of Representation, if Probate is required. The executors have to swear that they have declared all assets and liabilities of the Estate.
But when the Grant has been issued the Will becomes a public document and anyone can apply to the Court to see a copy. You can at this stage apply for copies of Probate and the will.
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Final Accounts
Once executors have probate or letters of administration they can collect and distribute the deceased's assets. They are legally obliged to follow the terms of the will. The personal representative must now produce final accounts - including expenses - for the residuary beneficiaries (those getting whatever is left once specific bequests have been made).