English Shefield Silver?

Hi, This is my first post here, I am curious about a set of silver I have. Its has most all of the original peices and I really dont know anything about it other than the story it was purchased a long time ago in my family. All of the peices in the set have markings with 2 letters followed by .800, For example the Bread knife in the set has DD.800 on the handle but the blade is made of stainless and says England Shefield. These are the only markings I can find on the set. Anyone have any clues? I apologize about the bad quality of the pictures, if you would like any more specifics let me know. THX