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The former Solicitors will not be willing to destroy the Will themselves, so your friend will need to write a simple letter to them requesting the return of both the WIlls and Deeds.
The letter should simply say-
I would be grateful if you could return to me the Deeds to my property known as xxxx
together with my Will dated xxx, which you are currently storing on my behalf.
I hope this assists and answers your question.