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I am afraid to say that unless the Will went to Probate, it remains a private document. As such, the Executors are entitled to retain it and are under no duty to disclose its contents, other than to the beneficiaries.
A person who has been left a specific item under the Will or a specific sum of money is entitled to see a copy extract from the Will which specifies their legacy.
A person who is a residuary beneficiary (ie someone who is to inherit a percentage of the whole Estate) is entitled to see a full copy of the Will.
Unless you were a residuary beneficiary, therefore, you are not entitled to see the whole of the Will.
As Probate was not granted, this implies that your Mother's Estate was valued at under £5-10,000, as Probate is only required if a person's Estate is valued over this figure.
I am sorry this is not the answer you were looking for, but it sets out the legal position.