Thanks for your reply.
A Will needs to be prepared for each person, so there will be a Will for your Granddad and a separate Will for your Nan.
A Will is a private document and whilst the person is alive, is not available to view by anybody else unless this person allows someone to see it. Therefore, you are not legally entitled to see your Nan's Will, unless your Nan willingly lets you see it, which I am guessing won't happen as she has alzheimer's.
As regards ***** *****'s Will, it appears you were left £2,000 which you have received. Under law, a beneficiary is entitled to see a copy extract from the Will showing their legacy. Therefore, if you were indeed gifted £2,000, all you are legally entitled to see is the clause in the Will stating your legacy.
However, if Probate was granted in respect of your Granddad's Will (this is required where the deceased left over £5,000 in their Estate), the Will becomes a public document, and any member of the public is entitled to apply for a copy via the post from the Leeds Probate Registry, for a nominal fee. Please have a look at the website- just google "copy Will Leeds Probate Registry".
If you think your Granddad may indeed have left you more money than the £2,000 you will soon be able to see, once you receive a copy of his Will.
I hope this helps you and answers your question.
Please feel free to let me know if you have any further queries.