I think I have figured out this is Sheffield Sterling 1977 Queens Jubilee Ingot. I am having trouble finding a good list of makers marks to identify the M&RF mark. Has anyone seen this before?
H&RF is new for me. It is very unlikely that you will find this mark identified online. The assay offices do not publish lists of marks so if you are really desperate to know the only way would be to contact the Sheffield Assay Office directly. As it is new to me may I include it in my own lists?
Phil
Hello! Thanks for looking at my pictures! I appreciate you! Please do keep a copy of it! 
-Ann