Hello and welcome to the forum.
The dishes are of an older style but assayed in Sheffield in 1982.
Currently a fair number of views of your question have been made and there is the suspicion that identification of the LJB mark is causing a problem in replying. This is because, as far as I know, there is no publication available for members of the forum to research modern marks to identify it for you
The Assay Office can be contacted direct at
http://www.assayoffice.co.uk clicking on the Library and Silver Collection section to see how to ask for identification of a mark. There is however a charge for that service.
If you do contact the Assay Office and discover a name for the mark would you please share it with us.
Mike