Hello and welcome.
I don't find that mark in my references.
Doubt that it is Dixon & Sons or Deykin & Sons.
Notice the letter G at the right end. Often, not always, British manufacturers will add the letter of their town to electroplate marks.
Look at the marks on this page http://www.925-1000.com/silverplate_L.html
Hamilton Laidlaw & Company has the last letter G for Glasgow, Scotland and T. Land & Sons has an extra S for Sheffield.
Just a possibility, your manufacturer may be from Glasgow.