MSS. of Locke

A translation, by Locke, of Nicole's Essays was published in 1828 by Harvey and Darton, London; and it is stated in the title-page of the book, that it is printed from an autograph MS. of Locke, in the possession of Thomas Hancock, M.D. I wish to know if Dr. Hancock, who also edited the volume, is still alive? and, if so, would let this querist have access to the other papers of Locke's which he speaks of in the preface?