"Much of my aunt Mary's household belongings were due to go in a skip and in amongst family papers and photographs I noticed a booklet with the MI7b stamp and thought it would be of interest, " said Mr Arter.
"There are about 150 separate articles made up of pencil drafts, manuscripts, and typescripts, along with notebooks and photographs, almost a complete picture of his life and times and his work - so much material that I haven't yet read it all, " Mr Arter added.